relax SVN archive

Created a branch of the 1.3 line for an overhaul of the test suite and to implement unit tests.

This is in response to the many discussions in the thread following Andrew Perry's post at
https://mail.gna.org/public/relax-devel/2006-10/msg00172.html (Message-id:
<c225763e0610292348w78ce48bfw2d0c6a41c72d0b@...>).

A good summary of the changes is given in Andrew's post at
https://mail.gna.org/public/relax-devel/2006-10/msg00192.html (Message-id:
<c225763e0610302038k55863c5ct165b68ffa4c0180c@...>).

Ported r2713 from the 'tensor_pdb' branch.

The command used was:
$ svn merge -r2712:2713 svn+ssh://bugman@.../svn/relax/branches/tensor_pdb/

This adds the text "re-run relax with the '--debug' flag" to the RelaxFault error class.

Added the text "re-run relax with the '--debug' flag" to the RelaxFault error class.

Added RelaxImplementError for raising an error when code is executed which hasn't been implemented.

The PyMOL macro functions now call this error.

Changed all references from Molmol to PyMOL in the PyMOL code. The macro fns raise RelaxErrors.

The 'self.macro_exec()' and 'self.write()' functions raise RelaxErrors saying that the functions
have not been implemented yet. The 'pymol.cartoon()' user function has been shifted to the top of
the function list in the 'prompt/pymol.py' file.

Implemented the 'pymol.tensor_pdb()' user function.

The numerous Molmol commands have been replaced by a single PyMOL load command.

Implemented the 'pymol.cartoon()' user function.

This was modified from the 'molmol.ribbon()' user function. The molmol commands have been replaced
with commands to hide everything, show the cartoon, and colour the cartoon by secondary structure.

The 'pymol.view()' user function now works.

A number of calls to pipes located at 'self.relax.data.molmol' where changed to
'self.relax.data.pymol'. The Molmol 'InitAll' and loading functions where changed to the PyMOL
equivalents. Now PyMOL executes and opens up the PDB file.

Ported r2705 and r2706 from the 1.2 line.

The command used was:
$ svn merge -r2704:2706 svn+ssh://bugman@.../svn/relax/1.2

This fixes bug #7583 (https://gna.org/bugs/?7583) and fixes a problem with one of the comments in
'specific_fns/model_free.py'.

Fix for bug #7583 (https://gna.org/bugs/?7583).

The problem was to statements 'if len(file_data[i]) != 4:' followed by 'continue'. These tests were
to avoid lines which contain no data, however it causes failures if there are not exactly for
columns! Now the minimum number of columns, based on the given column numbers, is tested for.