relax SVN archive

Modified the generate() function to accept any data pipe.

Fix for the copy() function, only the sequence is copied and not the contents of the SpinContainer.

Modified the test_copy_protein_sequence() unit test to check that only sequence data is copied.

Converted generic_fns.relax_data.copy() to the new relax design.

Fixed the checking of the pipe_from and pipe_to args in the relax_data.copy() user function.

Added a new arg unit test for the relax_data.copy() user function, checking when both pipes are None.

Brought the relax_data.copy() user function arg unit tests into line with the other copy() functions.

Fix for indecies in the test_copy_protein_sequence() unit test.

Missing deepcopy import.

Modified exists_mol_res_spin_data() to accept the data pipe arg.