relax SVN archive

The structure objects now use the pipe_loop() in their load_pdb() methods.

Created a new pipes API function, the pipe_loop().

Removed the unused import of the relax data store.

Removed a reference to 'run' in a comment.

Converted the create_vector_dist() function to the new design.

Again the problem was identified by looking at incorrect usage of the relax data store.

Alphabetical ordering of the methods.

Removed the unused relax data store.

Removed the results writing methods. This is now done by the universal XML results file code.

Bug fix for the __set_diff_tensor() method for reading the tensor from a relax 1.2 results file.

This was uncovered by searching for the relax data store. This store rather than the current data
pipe was being accessed. The additional large bug found is that the diffusion tensor was referred
to as 'diff' rather than 'diff_tensor'.

Removed the dependence on the relax data store.