relax SVN archive

Started to create some data for testing the frame order theory.

This will be used to generate synthetic data for all 9 models currently in relax.

Created the back end for the structure.rotate user function.

Created the front end for the new structure.rotate user function.

The purpose of this user function is to apply arbitrary rotations to the structures loaded into
relax about a given origin.

Added a few new argument checks for arrays and matrices of floats.

These are:
is_float_array()
is_float_matrix()

Added a few new RelaxError classes.

These include:
RelaxNoneListFloatError
RelaxMatrixFloatError
RelaxNoneMatrixFloatError

The BaseArgError class was also modified to handle the length arg (now the size arg) being a tuple
for matrix sizes.

Fix for the frame_order.cone_pdb user function.

The create_cone_pdb was referencing a non-existent variable!

Fix for the set up of Monte Carlo data for fixed alignment tensors in the N-state model.

The _minimise_setup_fixed_tensors() method has been fixed to return the actual tensor rather than
simulation for the fixed tensors, as there is no simulation tensor in that case.

The N-state model Monte Carlo simulations can now handle fixed alignment tensors.

Created the alignment tensor module return_tensor() function for returning tensors.

This takes fixed tensors into account, skipping them if the skip_fixed flag is set.

Created the alignment tensor module num_tensors() method for counting tensors.

This excludes fixed tensors by default.