relax SVN archive

Because of the previous commit (renaming 'pdb' to 'structure'), much code needed updating.

All calls to the functions of 'self.relax.generic.pdb' were replaced with the equivalent function in
'self.relax.generic.structure'. For example all calls to 'self.relax.generic.pdb.read()' are now
'self.relax.generic.structure.read_pdb'.

All instances of 'self.relax.interpreter._PDB' in the test suite were replaced with
'self.relax.interpreter._Structure'.

Renamed the 'pdb' user function class to 'structure'.

For full details, see the post at https://mail.gna.org/public/relax-devel/2006-11/msg00081.html
(Message-id: <7f080ed10611062354i6c4c8601y825585c2c021b9ab@...>).

Merged the 'tensor_pdb' branch back into the 1.3 line.

The command used was:
svn merge -r2664:2846 svn+ssh://bugman@.../svn/relax/branches/tensor_pdb

This branch arose from the discussions starting with post located at
https://mail.gna.org/public/relax-devel/2006-10/msg00136.html (Message-id:
<7f080ed10610252045r3dcbba38q58aa53142af96e5a@...>).

Ported r2844 from the 1.3 line.

The command used was:
svn merge -r2843:2844 svn+ssh://bugman@.../svn/relax/1.3

This adds the Eufrak to the model-free optimisation protocol diagrams of the manual in prepartation
for merging of the branch back into the 1.3 line.

Ported r2844 from the 1.3 line.

The command used was:
svn merge -r2843:2844 svn+ssh://bugman@.../svn/relax/1.3

This adds the Eufrak font to the model-free optimisation protocol diagrams of the relax manual.

Included the Eufrak font in the model-free optimisation protocol diagrams of the relax manual.

The Eufrak font, which was converted from the font used in the LaTeX eufrak package, was missing
when the images were converted from the SVG files.

WORK IN PROGRESS! addition of methods to find paths to unit test and
system directories. Plus functions to convert module names to paths.
Also added comments.

Removing the obsolete apply branch

Bug fix for the test suite 'results.read()' user function test.

This test was failing, again due to the inability to load the program state.

Bug fix for the failure of the test suite with the loading of Sparky peak heights.

This issue was that the exponential curve fitting saved state file 'rx.save.bz2' could no longer be
loaded. This is because of the complete redesign of 'self.relax.data' which has occurred in this
branch.