relax SVN archive

Small docstring updates.

The Selection.__contains__() method now is complete and all the relevant unit tests pass again.

Updated all the other comparisons to the selection object.

Updated the residue_loop() function.

Changed the spin_index_loop() function to use the same form as spin_loop().

Some fixes for the Selection.__contains__() method.

Redesigned the selection object method Selection.__contains__().

Now multiple MoleculeContainer, ResidueContainer, or SpinContainer instances can be compared.

Modified the spin_loop to check the tuple of (mol, res, spin) against the selection object.

Initialized merge tracking via "svnmerge" with revisions "1-5710" from
svn+ssh://bugman@.../svn/relax/1.3

Ok, lets try this again! Created a branch for some nasty breakages and testing new ideas.

The command used was:
svn cp svn+ssh://bugman@.../svn/relax/1.3 svn+ssh://bugman@.../svn/relax/branches/spin_loop_bool

The spin_loop and its siblings cannot currently handle the branching tree formed by the Selection
object (nested within Selection._union and Selection._intersect). For example if there are two
molecules loaded into the data store, 'Ap4Aase' and 'RNA', the spin_loop with the spin id string
'#Ap4Aase:Glu | #RNA@...' loops over all spins of both molecules!!! Therefore all the usages of the
Selection object need to be redesigned, and possibly the Selection object itself.