relax SVN archive

Added support for interfacing with Art Palmer's CPMGFit program.

The two new user functions relax_disp.cpmgfit_input and relax_disp.cpmgfit_execute have been created
to interface with CPMGFit. The first creates the per spin system CPMGFit input files as well as a
batch script for executing CPMGFit with all the input files. The second bypasses the batch script
and allows CPMGFit to be executed from within relax. This mimics the palmer and dasha user
functions. The back end code is in the new specific_analyses.relax_disp.cpmgfit module.

Fix for the setup of the relaxation dispersion GUI analysis.

The base method add_execute_relax() has been renamed to add_execute_analysis().

Fixes for the LM63 dispersion CPMG model.

The 'r2' model parameter is now an array as there is one R2 value per magnetic field strength. And
the 'rex' parameter has been renamed to 'phi_ex' and is scaled quadratically with the field strength
within the optimisation target function.

Added a script to the test suite shared data for analysing the truncated Hansen CPMG data.

Speedup for the relaxation dispersion system tests which use Flemming Hansen's CPMG data.

The system test script now reads the truncated data files (of only residues 70 and 71) to minimise
the time required to read the data and store it in the relax data store.

Created basic SVG and PNG graphics for the spectrometer user function class.

The spectrometer is black so as not to offend Bruker, Varian, or Jeol users by avoiding a colour
from one of these companies.

Modified the spectrometer.frequency user function so that a frequency list and count is stored.

These are the new cdp.spectrometer_frq_list and cdp.spectrometer_frq_count variables. This will
allow various parts of relax which assemble frequency information to be simplified and made more
consistent.

Merged the frq.set and temperature user functions into the new spectrometer user function class.

The frq.set user function is now called spectrometer.frequency and temperature is now
spectrometer.temperature. To match these changes, the cdp.frq variable is now called
cdp.spectrometer_frq.

The preview button in the file selection elements of the user function windows can now be disabled.

This is via the new wiz_filesel_preview argument being set to False.

Suppressed the reporting of skipped tests in the test suite if the module is set to None.