relax SVN archive

Improved the testing in the consistency testing calculate() method.

This mimicks the J(w) mapping changes of r5743 and r5744.

Fixed the setup of the maths_fns.consistency_tests.Consistency object.

This mimicks the J(w) mapping change of r5742.

Sorted some import statements.

Fix for the test_atom_loop_spin_selection1() unit test.

Wrote the RelaxTestRunner.addFailure() replacement method to prepend STDERR/STDOUT to the message.

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.