relax SVN archive

Fix for the Test_data.test_count_relax_times_r1rho relaxation dispersion unit test for Python 3.2+.

The '%s' representation of floating point numbers is different on these Python versions - the number
of decimal places used are different by default.

Updated one of the OMP model-free results files for the different ordering of parameters in the XML.

The changes to the parameter setup for the model-free analysis means that the XML files are now
ordered differently.

Python 2.5 and 2.6 compatibility for the Library.test_library_independence verification test.

The importlib package is not available in these Python versions, but the code in the Python 2.7
library file importlib/__init__.py is compatible all the way back to Python 2.3. Therefore the
importlib functions have been copied directly into the system test script and the importlib
dependency removed.

Improved error messages for when the GUI is launched but the wxPython installation is broken.

Now the case of a broken wxPython installation is handled rather than just a missing installation.
The dep_check module will store the import error message, and relax will now report that back to the
user.

Python 3 fix for one of the old scripts in the test suite directories.

Removed a debugging printout.

Missing import for the relaxation dispersion auto-analysis (from r22796).

Fix for bug #21924 (https://gna.org/bugs/?21924).

This is the failure to output 2D Grace plots for the R20, R20A, R20B, and R1rho0 relaxation
dispersion parameters. A simple test for missing data fixed the problem.

The relaxation dispersion auto-analysis now outputs the R20, R20A, R20B, and R1rho0 parameters.

This includes both text files and 2D Grace plots.

Updated the text for the software verification tests in the test suite.