relax SVN archive

STDERR is now being caught by the relax test suite TextTestRunner replacement.

Removed a newline character from the RelaxWarning system printout.

Added many checks to the angles calculation system test.

Completed the vectors() function.

The vector is now fetched, averaged over all models, and placed into spin.xh_vect. All the old code
has been axed.

Added the bond_vectors() prototype method to the structural API base class.

Created the Scientific Python structural API method bond_vectors().

Added the attached_atom() prototype method to the structural API base class.

Modified the vectors() function to call the non-existant structural API bond_vectors() method.

Modified the vectors() function to handle the atom position being a list.

Modified the attached_atom() method to handle multiple models.