/**
\page libPET History
\section history History
<PRE>
2000-08-11
  pivot.c, gaussdev.c and pearson.c were added to the library.
2000-09-09
  sif.c was added to the library.
  dft.c and dft.h were changed.
2000-11-30
  pivot.c and pivot.h changed.
2001-01-16
  changes in pivot.c, dft.c, dft.h, and integr.c
2001-02-21
  included new function in integr.c
2001-03-18
  included new function in integr.c
2001-03-31
  simulate.c was added to the library.
  Changes also in dft.c and integr.c
2001-04-09
  mathfunc.c was added to the library.
2001-05-27
  correl.c removed.
  changes in pearson.c
2001-06-09
  Changes in simulate.c
2001-07-03
  Changes and new functions in simulate.c
2001-07-08
  Changes in simulate.c
2001-07-23
  Changes in integr.c
2001-08-08
  Changes in pivot.c and pivot.h
2001-08-15
  Change in pearson.c
2001-09-28
  llsqwt.c was added to the library.
  Change in integr.c to avoid warnings during compilation.
2002-01-20
  img.c, swap.c and ecat63.c were added to the library.
2002-02-01
  New versions of swap.c and ecat63.c.
2002-02-14
  New versions of integr.c and ecat63.c.
2002-02-18
  roi.c and intex.c were added to the library.
2002-02-21
  Change in dft.c and swap.c.
2002-03-13
  New function in simulate.c.
2002-03-31
  Corrections and additions in ecat63.c, img.c and img.h.
2002-06-26
  result.c was added to the library.
2002-07-27
  Additions in result.c
2002-07-30 VO
  Change in result.h, several additions in result.c
  Tiny change also in dft.c, mathfunc.c, sif.c and img.c
2002-08-08 VO
  Changes in halflife.h and branch.h
2002-08-14 VO
  Change in result.c and result.h
  powell.c was added to the library.
  simplex.c was added to the library.
2002-08-19 VO
  nnls.c was added to the library.
2002-08-23 VO
  Changes in img.?, ecat63.?, and swap.?.
2002-09-09 VO
  Changes in llsqwt.c
2002-09-11 VO
  Change in ecat63.c
2002-09-14 VO
  Change in gaussdev.c and gaussdev.h
2002-09-28 VO
  Changes and additions in llsqwt.c and llsqwt.h
  Changes in pearson.c
2002-10-10 VO
  Additions in result.c
  Change in dft.c
2002-10-17 VO
  Change in result.c
2002-10-22 VO
  pivot.c was replaced by tgo.c
2002-10-28 VO
  Changes in llsqwt.c and llsqwt.h
2002-10-31 VO
  Correction in llsqwt.c
2002-11-14 VO & KS
  Changes in result.? and tgo.?
2002-11-22 AS
  Addition in roi.c and roi.h
2002-12-01 VO
  Changes in img.? and dft.c
2002-12-03 VO
  Additions in img.?
2002-12-23 VO
  Changes in img.? and ecat63.c
2003-01-19 VO
  Additions in result.?
2003-01-23 AS
  Changes in roi.c and roi.h
2003-02-04 VO
  Increased max nr of parameters in tgo.h, simplex.h and powell.h
2003-02-12 VO
  Change in dft.c
2003-02-19 VO
  bootstrap.c was added to the library.
  Change in result.c
  Additions in mathfunc.c and mathfunc.h
2003-03-04 VO
  Addition in simulate.c and .h
  Additions in mathfunc.c
2003-03-07 AS
  Change in roi.c & roi.h
2003-03-17 VO
  Change in mathfunc.c
2003-03-19 VO
  Change in mathfunc.c
2003-03-20 VO
  aic.c was added to the library.
2003-03-25 VO
  Changes in tgo.c and .h
2003-03-29 VO
  More changes in tgo.c and .h
  Small change in powell.c
2003-04-16 VO
  Change in result.c
2003-05-08 KS & VO
  Addition in nnls.c and .h
2003-05-12 KS
  Change in nnls.c and .h
2003-06-19 VO
  Addition in dft.c and .h
  Minor change in llsqwt.c
2003-07-01 VO
  imgproc.c was added to the library.
2003-07-07 VO
  Changes in simulate.c
  Included halflife.c; additions in halflife.h
  Additions in imgproc.c and .h.
2003-07-17 CL
  New API for roi.c
  Added a new function to intex.c
2003-07-25 VO
  Included ecat7r.c, ecat7w.c, ecat7ml.c, ecat7p.c and ecat7.h
  Included imgfile.c and .h
  IMG i/o functions moved from ecat6.c to imgfile.c
  Contents of ecat6.c separated into ecat6r.c, ecat6w.c, ecat6ml.c and
  ecat6p.c
  Included rounding.c and .h, where roundf() is moved from ecat63.c.
2003-07-27 VO
  Additions in imgfile.c and .h.
  Additions in imgproc.c and .h.
  Additions in ecat7ml.c and .h.
2003-08-03 VO
  Additions in ecat7.h.
2003-08-04 VO
  Additions in imgproc.c and .h.
2003-08-05 VO
  Additions in ecat63ml.c and .h.
2003-08-11 VO
  Change in imgfile.c.
2003-08-13 VO
  Changes in dft.c and in comments of dft.h.
2003-08-15 VO
  Changes in mathfunc.c and in comments of mathfunc.h.
  Changes in dft.c.
2003-09-01 VO
  Included hholder.c and .h.
  Included qr.c and .h.
2003-09-08 VO
  Changes in ecat7.h and ecat63.h.
  Changes in ecat63r.c and ecat63w.c.
  Changes in ecat7r.c and ecat7w.c.
  Changes in imgfile.c and .h.
  Changes in img.c and .h.
2003-09-11 VO
  Changes in hholder.c and .h, and qr.c and .h.
2003-09-24 VO
  Change in imgproc.c.
2003-09-30 VO
  Change in imgproc.c and .h.
2003-10-05 VO
  Included analyze.c and .h.
  Changes in imgfile.c and .h.
  Changes in imgproc.c and .h.
2003-10-07 VO
  Change in imgfile.c.
2003-10-08 VO
  Change in imgfile.c.
  Change in ecat7.h.
2003-10-09 VO
  Included median.c and .h.
2003-10-13 VO
  Change in result.c.
  Change in imgproc.c and .h.
2003-10-21 VO
  Changes in hholder.c and .h, and qr.c and .h.
  Change in imgfile.c.
2003-11-04 VO
  Change in imgfile.c.
  Change in img.c.
2003-11-06 VO
  Change in nnls.c.
2003-11-10 VO
  Changes in imgfile.c.
2003-11-12 VO
  Change in imgfile.c.
2003-11-30 VO
  rounding.? renamed as petc99.?.
  Changes in ecat7w.c, ecat63w.c, roi.c, and imgfile.c.
2003-12-02 VO
  Change in result.c and .h.
2003-12-05 VO
  Changes in imgproc.c and .h.
  Changes in analyze.c and .h
  Changes in imgfile.c.
  Changes in dft.c and .h.
2003-12-10 VO
  Changes in imgfile.c.
  Change in analyze.c.
2003-12-14 VO
  Changes in img.c and .h.
  Changes in imgfile.c.
  Change in imgproc.c and .h.
2003-12-18 VO
  Included vol.c and vol.h.
  Changes in imgproc.c and .h.
  Changes in img.c and .h.
2004-01-07 VO
  Change in ecat7w.c and ecat63w.c.
2004-01-14 VO
  Changes in integr.c.
2004-01-20 VO
  Changes in integr.c and .h.
2004-01-21 VO
  Change in dft.c.
2004-01-22 VO
  Change in bootstrap.c.
2004-01-26 VO
  Changes in dft.c and .h.
  Changes in result.c and .h.
2004-01-27 VO
  Changes in dft.c and .h.
2004-01-28 VO
  Changes in halflife.c.
2004-01-29 VO
  Changes in vol.c and .h.
2004-02-02 VO
  Change in halflife.h.
2004-02-05 VO
  Changes in analyze.c and imgfile.c.
2004-02-08 VO
  Changes in ecat7.h.
  Changes in imgfile.c.
  Change in ecat63p.c.
2004-02-22 VO
  Changes in imgfile.c.
2004-03-18 VO
  Change in imgproc.c.
2004-04-06 VO
  Changes in mathfunc.c.
2004-04-07 VO
  Changes in mathfunc.c.
2004-05-11 VO
  Changes in pearson.c and .h.
  Additions in README and history required by Doxygen.
2004-05-23 VO
  Addition in ecat7p.c, ecat7r.c and ecat7.h.
  Changes in imgfile.c.
  Changes in img.c and .h.
  Changes in dft.c and .h.
2004-05-24 VO
  Change in imgfile.c.
2004-05-25 VO
  Addition in dft.c and .h.
2004-06-20 VO
  Change in ecat63ml.c and ecat7ml.c.
2004-06-21 VO
  Change in ecat7r.c.
  Change in ecat63r.c.
  Change in img.c.
2004-06-23 VO
  Change in imgproc.c.
2004-06-27 VO
  Change in imgfile.c.
  Changes in ecat63ml.c and ecat63.h.
  Changes in ecat7ml.c and ecat7.h.
2004-07-01 VO
  Change in ecat63ml.c.
2004-07-10 VO
  Nonsignificant change in imgfile.c.
2004-07-12 VO
  Changes in result.c and .h.
  Nonsignificant change in tgo.c.
  Nonsignificant change in powell.c.
2004-07-18 VO
  Changes in imgproc.c and .h.
2004-07-20 VO
  Changes in imgproc.c and .h.
2004-07-21 VO
  Changes in llsqwt.c.
2004-07-26 VO
  Nonsignificant changes in img.h, dft.h, ecat7.h and result.h.
2004-08-15 VO
  Included ift.c and ift.h.
  Change in ecat7p.c.
2004-08-17 VO
  Change in result.c and result.h.
  Addition in dft.c and dft.h.
2004-08-23 VO
  Changes in dft.c and dft.h.
  Changes in result.c and result.h.
  Included studynr.c and studynr.h.
  Changes in sif.h.
  Nonsignificant changes in vol.h.
  Changes in img.c, img.h and imgfile.c.
2004-08-26 VO
  Change in dft.c.
2004-09-05 VO
  Change in studynr.c and studynr.h.
  Change in dft.c and dft.h.
2004-09-17 VO
  Changes in comments in swap.c, gaussdev.c, aic.c, intex.c, sif.c,
  simulate.c, simplex.c, hholder.c, median.c, qr.c, nnls.c, roi.c,
  ecat63w.c, ecat7w.c, integr.c, bootstrap.c, halflife.c, analyze.c.
2004-09-20 VO
  Changes in comments in ecat63p.c, ecat63r.c, ecat63ml.c,
  mathfunc.c, pearson.c, tgo.c, powell.c, imgproc.c, llsqwt.c,
  ecat7r.c, ecat7ml.c, ecat7p.c, ift.c, img.c, imgfile.c, dft.c,
  studynr.c. analyze.h, ecat7.h, mathfunc.h, roi.h.
2004-09-24 VO
  Changes in ecat7.h, img.c, imgfile.c, imgfile.h.
2004-10-10 VO
  Change in imgfile.c.
2004-10-13 VO
  Changes in imgfile.c, mathfunc.c, result.c and sif.c.
2004-10-14 VO
  Change in ift.h.
2004-10-15 VO
  Change in ift.c and ift.h.
2004-11-07 VO
  Change in petc99.c and imgfile.c.
  Included libpetv.c and libpetv.h.
2004-11-10 VO
  Change in ecat7r.c.
2004-11-18 VO
  Critical patch in roi.c.
2004-11-23 VO
  Changes in ift.c and ift.h.
2004-11-25 VO
  Included ncifile.c and ncifile.h.
2004-11-30 VO&CL
  Change in petc99.c.
2004-12-04 VO
  Change in dft.c and ncifile.c.
2004-12-09 VO
  Change in dft.c and dft.h.
2004-12-22 VO
  Included idcrypt.c and idcrypt.h (by CL).
  Changes in roi.c and roi.h (by CL).
  Change in imgfile.c.
2004-12-27 VO
  Changes in imgfile.c.
  Changes in ecat7w.c and ecat7.h.
  Changes in ecat63w.c and ecat63.h.
2005-01-05 Kaisa Sederholm & VO
  median.c moved into librob.
2005-01-06 VO
  ift.c moved into libift.
2005-01-12 VO
  Minor changes in sif.c and sif.h.
2005-01-17 VO
  sif.c and sif.h moved into libsif.
  Changes required in imgfile.c and Makefile.
2005-01-21 VO
  Changes in halflife.c and halflife.h.

</PRE>
*/

