relax SVN archive

Fix for bug #24601.

This is the failure of the optimisation of the 'R2eff' dispersion model when peaks are missing from
one spectrum, as reported by Petr Padrta at https://gna.org/bugs/?24601.

To handle the missing data, the peak intensity keys are now checked for in the spin container
peak_intensities data structure. This is both for the R2eff model optimisation as well as the data
back-calculation. A warning is given when the key is missing. The relaxation dispersion
base_data_loop() method has been modified to now yield the spin ID string, as this is used in the
warnings.

In addition, the Grace plotting code in the relax library was also modified. When peak intensity
keys are missing, some of the Grace plots will have no data. The code will now generate a plot for
that data set, but detect the missing data and allow an empty plot to be created.

Simplified the Relax_disp.test_bug_24601_r2eff_missing_data system test.

This is to allow the test to catch bug #24601 to complete in a reasonable time (2 seconds on one
system).

Created a system test for catching bug #24601.

This is the failure of the optimisation of the 'R2eff' dispersion model when peaks are missing from
one spectrum, as reported by Petr Padrta at https://gna.org/bugs/?24601. The test uses his data and
script to trigger the bug.

Fix for the GUI status bar element widths.

Fixed widths in pixels causes text truncation on many systems, depending on the width of the main
relax window. Instead variable widths should be used to allow wxPython to more elegantly present
the text while minimising truncation.

Updated the frame order auto-analysis for the time -> system.time user function change.

When the userfunction script() is called, a notification of pipe_alteration is made.

This will force the GUI to update, and make sure that it is up to-date.

Optimising the width of the statusbar.

Added a newline character after printing the script.

Fix for GUI prompt bug, where ansi escape characters should not be printed when interpreter is inhereted from wxPython.

Changin the Keyboard shortcut for Changing the working directory to Ctrl+W. Since Ctrl+C is often used for copying (from the terminal).