relax SVN archive

Redirection of system output to relaxGUI controller is temporarly disabled for automatic model-free calculation.

This is done to find the error causing relaxGUI to crash in final analysis, as discussed here: https://gna.org/task/?6847#comment40.

Added a series of new cone types to generic_fns.structure.cones.

Renamed the initialised PyMOL executable object from 'pymol' to 'pymol_ob'.

This is to avoid the name clash with the pymol python package.

Renamed the prompt and generic_fns pymol modules to pymol_control to avoid the clash with real PyMOL.

Started to redesign the generic_fns.pymol module to use the pymol python package.

This involves much renaming of the PyMOL pipe object which is not the PyMOL executable object. This
attempts to use the pymol python package, and if not available PyMOL will be run from the command
line as a pipe.

Added the import of pymol modules to the dependency checks.

Removed the pipe check from the pymol.command() user function.

This is not necessary.

Bug fix for the generate_vector_dist() function.

The limits function was being called even if not supplied! This change fixes that.

Bug fix for back_calc_ri()!

The bug was introduced at r10967. The check for missing data was not performing correctly, causing
the Monte Carlo simulations to be stuck in an infinite loop!

Fix for the cone_edge() function for a non-zero apex position.