relax SVN archive

Added code to vectors() to determine if the attached atom is a proton or not.

Fixed all calls to generic_fns.mol_res_spin.wildcard_match().

The function is now called generic_fns.relax_re.search().

Spun out the wildcard_match() function into a new module for relax regular expression.

Reverted all bond_vector references to xh_vector.

Fixes for the ellipsoid_frame() function.

Fixed two calls to structure.vectors() in the system tests.

Wrote 4 arg unit tests for the structure.vectors() user function.

Fix for the proton arg test of the structure.vectors() user function - it's now the attached arg.

Fixed the call to the __residue_loop() method from bond_vectors().

Fixed the call to the __molecule_loop() method from bond_vectors().