relax SVN archive

The test suite now terminates on a failed test if the flag '--debug' is passed to relax.

Modified the summary description of each test.

The start of each is capitalised and a couple have been modified.

Removed the text 'Test of ' from the front of each test in the summary of the test suite.

Added a test of the user function 'relax_data.read()' to the test suite.

Added the ability to execute Molmol macros on the prompt and pipe them into the program.

Fixed the X11 colour list by removing duplicates.

The Molmol and X11 colour lists can now be explicitly chosen by the 'molmol.write()' user function.

Added all the X11 colours from the file '/usr/X11R6/lib/X11/rgb.txt' to the colour file.

Reverted the change of r2462. This was an attempt at fixing bug #5746.

The bug which was reported by Chris MacRaild is located at
https://gna.org/bugs/?func=detailitem&item_id=5746.

The command used to revert the change was:

$ svn merge -r2462:2461 .

Fix to bug #5753.

The bug is located at https://gna.org/bugs/?func=detailitem&item_id=5753.

The fix simply involved adding a test for the presence of the run name key in self.relax.data.pdb.