relax SVN archive

Updated the pymol and molmol macro menu entries to match the back end.

Renamed the PyMOL and Molmol macro user functions to match the back end.

Built the back end of the molmol.macro_run user function.

Built the back end of the pymol.macro_run user function.

Renamed the PyMOL and Molmol macro user function back ends.

Modified the Molmol macro related user function front end to match those of PyMOL.

These are:
- molmol.macro_exec() is now molmol.macro_apply().
- molmol.write() is now molmol.macro_write().
- molmol.macro.run() has been added to execute macros from text files.

Some fixes and improvements to the PyMOL macro related user functions.

Created the front end for the pymol.macro_run user function.

This will be used to open and execute macros from text files.

Renamed the PyMOL macro related user functions in the prompt/script front end.

The pymol.macro_exec() function is now called pymol.macro_apply(), and pymol.write() is now called
pymol.macro_write() to make it clearer.

A first trial at passing the "curve_type" to the C code.

However, something is wrong, potentially in the C code (see
compilation warning below) as relax now complains that
"an integer is required" for assignment to "curve_type":

====
maths_fns/relax_fit.c: In function 'setup':
maths_fns/relax_fit.c:66: warning: assignment makes integer from pointer without a cast
====

Anybody, any idea ?