relax SVN archive

Fix for bug #23288 (https://gna.org/bugs/?23288).

This is the failure of the structure.read_pdb user function when simultaneously merging multiple
molecules from one file. The set_mol_name and set_model_num arguments are now converted to lists
equal to the length of the read_mol and read_model arguments simultaneously, if supplied.

Created the Structure.test_read_merge_simultaneous system test.

This is to demonstrate a failure in the structure.read_pdb user function when merging multiple
molecules from one file into one molecule simultaneously with a single user function call.

Small correction for the structure.read_pdb user function description.

Deleted a number of Frame_order.test_distribute* system tests.

These are the four double rotor model tests. The frame_order.distribute user function cannot
operate on these test cases as one of the two torsion angles are set to zero in the tests.

The frame_order.distribute user function now warns when the maximum rotations are reached.

Changed the default max_rotations argument value to 100,000 in the frame_order.distribute user function.

This decrease from one million is so the user function completes in a reasonable amount of time.

The Frame_order.test_auto_analysis system test now sets the results file compression type to bzip2.

Changed the default relax results compression type to bzip2 in the frame order auto-analysis.

This was set to no compression for speeding up some system tests, however the system tests can set
this for themselves.

Speed up of the Frame_order.test_auto_analysis system test.

After the introduction of the frame_order.distribute user function into the auto-analysis, the test
was taking far too long to complete. Now the distribution arguments are set to low values to allow
the test to pass in under a minute.

Improved control of the frame_order.distribute user function in the frame order auto-analysis.

The maximum number of rotations can now be set, and the argument for the total states for the
distribution has been shortened.