relax SVN archive

The PyMOL macro is registered as a pymol file in the results file structure rather than a Grace file.

The force flag now defaults to True for the molmol.write and pymol.write user function GUI pages.

Fixes for the pymol.write and molmol.write user function GUI pages.

The directory argument to the user function back end is now set to None as otherwise it defaults to
a directory such as 'pymol' which is then incompatible with the absolute file path from the file
dialog.

Added parsing of the "curve_type" argument.

Not clear if this is needed, but the code compiles.
This, however, does not solve the issue of relax thinking the C module is not compiled,
giving the following error message upon launching:

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ImportError: dlopen(/Users/semor/Documents/pse-4/collaborations/relax/relax-1.3_inversion-recovery/maths_fns/relax_fit.so, 2): Symbol not found: _curve_type
Referenced from: /Users/semor/Documents/pse-4/collaborations/relax/relax-1.3_inversion-recovery/maths_fns/relax_fit.so
Expected in: flat namespace
in /Users/semor/Documents/pse-4/collaborations/relax/relax-1.3_inversion-recovery/maths_fns/relax_fit.so
Relaxation curve fitting is unavailable, try compiling the C modules.
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Created the model-free PyMOL macro functions by copying the Molmol ones.

This will need to be modified as Molmol commands are still being issued.

Fix for the results viewer window in testing mode - it is now not shown.

Added a line for memory allocation of the "curve_type" array.

A further step at getting the chosen equation passed from Python to C.

Not clear if it works.
Need for fixing the dependency check, as relax thinks the C module is
not compiled, although compilation seems to happen without error...

Fix for the pipe editor window - it is now updated when initially created to show all loaded pipes.

Fixes for all the calls to the GUI interpreter instance.

This is now a special thread object, and user function calls are now queued.