relax SVN archive

Propagation of the spin_id variable.

An important fix for the model-free minimisation code for the merged count_spins() function.

Another fix for the test_count_spins() unit test.

Fixed the test_count_spins() unit test.

Removed the call to count_selected_spins().

Merged the count_selected_spins() function into count_spins().

Wrote the count_molecules() and count_residues() functions.

Wrote the determine_seq_type() function.

Fatal indentation fix.

Shifted the focus of the Grace module from residues to spins.