relax SVN archive

relax version 1.2.13.

This release adds significant new features and fixes some important bugs.

Converted the uniform vector distribution object into a list of numpy float64 arrays.

Small fix for the xh_vector() method.

Fix for the vectors() function.

Modified the module docsting to say that the methods aren't all prototypes.

Added the structural API base class method num_str().

This base class method is not a stub, but returns the length of 'self.structural_data'.

Prepared for a new structural API method, num_str(), for counting the number of structures.

Fix for extract() to handle residue misalignment between mfout and the relax data store.

Fixed all the calls to get_mf_data().

Fix for the get_mf_data() function.