relax SVN archive

Large improvement for the lib.software.grace module.

The '*_err' and '*_bc' parameter names for the parameter error and back-calculated parameters
respectively are now supported. This allows these values to be easily plotted.

Removed the frame order API return_units() method.

This method has been superseded by the parameter list object.

Fixes for the units of the ave_pos_x, ave_pos_y, and ave_pos_z frame order parameters.

Replaced the frame order API model_type() method with the base _model_type_global() method.

The two methods were identical anyway.

Replaced the frame order specific API model_loop() method.

The base method _model_loop_single_global() is used instead.

Created the specific analysis API common method _is_spin_param_false().

This simply returns False. The is_spin_param() frame order method has been deleted and this common
method is now used instead.

The specific API PARAMS object is now private.

Apart from fixing a number of unit tests, these aliased singletons should not be accessed by the
rest of relax.

Shifted the frame order specific API deselect() method into the Api_common base class.

The method has been renamed to _deselect_global() and extended to handle Monte Carlo simulations.

Eliminated the specific analysis API object base __init__() method.

This is no longer needed as the parameter list object is now analysis specific and set up by each
analysis type separately. The calls to this method from the derived classes have therefore also
been deleted.

Comment fix.