relax SVN archive

Updated the specific_analyses.relax_disp package __all__ list.

This was identified in the previously committed unit test.

Added the unit test infrastructure for testing the specific_analyses.relax_disp package.

This currently includes the package __all__ list unit test.

Created two new LaTeX commands for improving the layout of user functions in the relax manual.

These are \ufsep and \ufus which will be used to format the user function separator character and
the underscore character respectively. They are used in the \uf{} commands to add the
'.\linebreak[0]' and '\_\linebreak[0]' text to allow for improved and consistent line breaking.

Converted all LaTeX files of the manual to use the new \ossep and \osus commands.

This will result in better formatting of the manual by making the linebreaking after '/' and '_'
characters consistent and universal.

Created two new LaTeX commands for improving the layout of the relax manual.

These are \ossep and \osus which will be used to format the file and directory separator character
and the underscore character respectively. They will be used in the \file{} and \directory{}
commands to add the '/\linebreak[0]' and '\_\linebreak[0]' text to allow for better line breaking.

Improvement to the formatting of the GUI menu item text in the manual.

The text can now have a line break between the items, just after the arrows. This significantly
improves the paragraph layout in the manual.

Started to create the tutorial in the manual for using the dispersion GUI.

This is at the end of the relaxation dispersion chapter of the manual and covers the basic setup of
spin systems. It includes the recently added screenshots.

Added some initial screenshots of the dispersion GUI analysis.

These will be used to create a tutorial for using the relaxation dispersion analysis in the GUI to
be added to the dispersion chapter of the relax manual.

Added a systemtest for using both calc() and a systemtest for relax_disp auto analysis.

Regarding bug #21665, (https://gna.org/bugs/?21665) - Running a CPMG analysis with two fields at two delay times.

Added systemtest to catch bug: relax -s Relax_disp.test_bug_21665_cpmg_two_fields_two_delaytimes_fail

Regarding bug #21665, (https://gna.org/bugs/?21665) - Running a CPMG analysis with two fields at two delay times.