relax SVN archive

Import fix for the shift of the pivot finder target function.

Added a document detailing the possible future layout of relax's packages.

Added a sentence to the README file about the sample_scripts directory.

Shifted the ensemble pivot finding target function into the maths_fns package.

The structure.find_pivot user function now accepts the func_tol argument.

This is used to terminate the simplex optimisation when this function tolerance value is reached.

Created the Structure.test_web_of_motion_13 system test.

This was just to be sure that the models argument was correctly handled by the structure.web_of_motion
user function.

Fixes for the Structure.test_web_of_motion_12 system test.

The PDB output was not compared to the correct results.

Implemented the models argument for the structure.web_of_motion user function.

This was previously not being used and was caught by the Structure.test_web_of_motion_12 system
test.

Created the Structure.test_web_of_motion_12 system test to show how model sets are currently ignored.

Small fixes for the Structure.test_web_of_motion_all system test.