relax SVN archive

Replaced the 'elif' statements with 'if' in the frame order update_model() function.

This is to avoid possible future bugs as the logic was not consistent.

The frame order axis alpha angle is now defined in the grid search from -pi to pi.

Bug fixes for the frame order axis alpha parameter in the unpack_opt_results() function.

This is in specific_analyses.frame_order.optimisation.unpack_opt_results(). The axis alpha angle
from optimisation was being stored as axis_phi angle instead. And the axis alpha angle was not
being handled by the Monte Carlo simulations.

Added the axis alpha angle to the frame order return_units() API method.

The frame_order.pivot user function can now be used to turn the pivot optimisation on and off.

If the pivot point is not given, this user function will now just set the fixed flag and nothing
else, allowing the optimisation status of a pre-set pivot to be changed.

Updated the Python download links for version 2.7.6 at http://www.nmr-relax.com/download.html.

Added a sentence to the wxPython section explaining why Python 2 is necessary.

This is for the download page http://www.nmr-relax.com/download.html.

Simplified all of the CaM frame order optimisation testing scripts.

These are for the synthetic test suite data. The unnecessary class structure of the scripts has
been eliminated.

Updated the ancient test_suite/shared_data/frame_order/cam/rotor2/pcs_only/frame_order.py script.

This now matches the script of its parent directory.

Updated all of the frame order optimisation scripts for the CaM test suite data.

These simple testing scripts were very much out of date and non-function for the current code. Half
of the code in these scripts is now implemented in the concise frame_order.pdb_model user function.