relax SVN archive

Changed 'relax_time' instances to 'cpmg_frq'.

Changed all instances of 'relax_times' to 'cpmg_frqs' and made other small changes.

Renamed 'cdp.frq' to 'cdp.cpmg_frqs' so it is not confusing with the spectrometer frequency.

Indeed, 'cdp.cpmg_frqs' points to the CPMG pulse train frequency (nu_cpmg).

Moved the relax_time() function to cpmg_frq() and made other small changes.

Still much (!) work is needed for this code to be complete.

Made a few changes towards a functional relaxation dispersion code.

This includes several modifications as well as the addition of the exp_type() function.

Copied the 'relax_fit.py' specific functions to 'relax_disp.py'.

The command used was:
svn cp specific_fns/relax_fit.py specific_fns/relax_disp.py

The code will now need many many many changes to suit the needs of relaxation disperison.

Added a test for CPMG data in slow-exchange and changed the name of the test for fast-exchange.

Modified the script so it will test for fast-exchange curve fitting from CPMG data.

Data and functions to treat it arestill missing.

Copied the 'relax_fit.py' script to 'relax_disp.py'.

The command used was:
svn cp test_suite/system_tests/scripts/relax_fit.py test_suite/system_tests/scripts/relax_disp.py

This file, obviously, will need to be modified to suit the needs of the relaxation dispersion code.

Added functions to select the experiment type and mathematical model used.

These functions allow the user to select the experiment type (cpmg or r1rho) as well as the
mathematical model to fit the data (fast or slow).

These changes follow a discussion on relaxation dispersion, and mainly the post at:
https://mail.gna.org/public/relax-devel/2009-01/msg00020.html
(Message-id: <7f080ed10901070529s397f7f23p914c820ced4d07f@...>)