relax SVN archive

Rewrote the branches section of the development chapter to describe the use of svnmerge.py.

Initialized merge tracking via "svnmerge" with revisions "1-5968" from
svn+ssh://bugman@.../svn/relax/1.3

Created a branch for the porting of the multi_processor branch into the current 1.3 line code base.

Loosened the model-free optimisation tests as different numpy versions were affecting the precision.

The checks of the model-free params and chi2 use self.assertAlmostEqual() again, as numpy was
causing float differences at around the machine precision mark.

Fixed a bug in the copy() fn uncovered by the fix of r5966.

Removed some dodgy code from return_molecule().

Improvements for the add_item() methods of MolecularContainer, ResidueContainer, and SpinContainer.

The logic is much improved and split into 2 parts: replace the current empty container or append a
new container.

Spun off half of the read() function into the new generate() function.

The new function will be very useful for other parts of relax.

Improved the wildcard_match() function to allow comparisons of the strings both ways.

The Selection.contains_*() methods now call the wildcard_match() function for comparisons.