relax SVN archive

Bug fix.

The spin_loop() and molecule_loop() generator functions now accept zero arguments for the selection
of everything. This fixes two of the unit tests. The test_molecule_loop_no_selection() unit test
has also been fixed.

Multiple unit tests for the spin_loop(), residue_loop(), and molecule_loop() generator functions.

These generator functions belong to the 'generic_fns.selection' module.

Created the RelaxMolSelectDisallowError and RelaxResSelectDisallowError errors.

Wrote the molecule_loop() generator function for looping over and returning molecule containers.

The full generator function is generic_fns.selection.molecule_loop().

Wrote the spin_loop() generator function for looping over and returning spin containers.

For more info, see my post at https://mail.gna.org/public/relax-devel/2006-10/msg00057.html
(Message-id: <1160557041.9523.74.camel@...>). The idea of the
generator function, using the yield statement, to return the spin data containers was given by Gary
Thompson at https://mail.gna.org/public/relax-devel/2007-01/msg00014.html (Message-id:
<f001463a0701071417w6bd7927cp8fdd052e698575ec@...>). More details are given by Chris
MacRaild at https://mail.gna.org/public/relax-devel/2007-01/msg00036.html (Message-ID:
<1168883717.7569.511.camel@...>).

The full generator function is generic_fns.selection.spin_loop().

Fixed the select.reverse() user function.

The generic_fns.selection.reverse() function still does not work as the spin_loop() function needs
to be implemented.

Bug fix. Removed the import of the now non-existant Selection class.

Wrote a unit test for the generic_fns.selection.reverse() function.

Converted all the class methods of the 'generic_fns.selection' module into functions.

The unsel_*() methods have been renamed to desel_*() and the functions alphabetically sorted.

Implemented the generic_fns.residue.delete() function (although it doesn't work yet).

This function has been coded to use the UCSF selection syntax as described in Gary Thompson's post
located at https://mail.gna.org/public/relax-devel/2007-01/msg00014.html (Message-id:
<f001463a0701071417w6bd7927cp8fdd052e698575ec@...>).

The function makes use of three new selection functions - tokenise, parse_token, and molecule_loop.
The first two are described at https://mail.gna.org/public/relax-devel/2007-01/msg00036.html
(Message-ID: <1168883717.7569.511.camel@...>). The last function is similar to the spin_loop
function described in the same post. All three are yet to be implemented (although stubs have been
created for the functions).

The RelaxError 'RelaxSpinSelectDisallowError' has been created to prevent spins from being selected
by the user function.

The unit tests for generic_fns.residue.delete() have been updated and two more added:
test_delete_all() and test_delete_shift().