relax SVN archive

Changed the CSA values in the sample scripts from -160 ppm to -170 ppm.

This idea was suggested at https://mail.gna.org/public/relax-users/2006-09/msg00045.html
(Message-id: <7f080ed10609290808u3d30d31cp8ca6040a239a806d@...>). The parent thread by
Sébastien Morin of the subject of the CSA & bond length is located at
https://mail.gna.org/public/relax-users/2006-09/msg00042.html (Message-id:
<451C1910.6060108@...>).

Changes to Chapter 2 of the manual (sample scripts and the test suite).

These changes complete task #3781 (https://gna.org/task/?3781).

The sample script section has been modified and a section for the relax test suite has been added.

Merged r2579 to r2581 of the 1.2 line into the 1.3 line.

The command used was:
svn merge -r2578:2581 svn+ssh://bugman@.../svn/relax/1.2

This includes a fix for bug #7192 and a few other superficial changes.

Fix for bug #7192 (https://gna.org/bugs/index.php?7192).

This bug was reported by Alex Hansen (viochemist_at_gmail_dot_com) and was
originally described at:
https://mail.gna.org/public/relax-users/2006-09/msg00026.html
(Message-id: <481156b20609251426r4a74f9f1p8fcf564354e61892@...>).

In addition to the fix of not skipping unselected residues described at
https://mail.gna.org/public/relax-devel/2006-09/msg00018.html
(Message-id: <7f080ed10609261109p2c7229e4ie02a894ac110dc3a@...>), I
have also added code to the 'self.num_instances()' model-free function to catch
the situation of 'self.determine_param_set_type()' returning None. If this
occurs, RelaxFault is raised!

Removed a few lines of sconstruct code which had been commented out and are no longer used.

Merged r2506 to r2578 of the 1.2 line into the untouched 1.3 line.

The command used was:
svn merge -r2506:2578 svn+ssh://bugman@.../svn/relax/1.2

Removed a duplicated import statement (of the Float class).

Removal of the 'nan_catch_test' branch. This branch was merged into the 1.2 line at r2553.

The commit message of the merge is located at https://mail.gna.org/public/relax-commits/2006-09/msg00008.html (Message-id: <E1GJnLY-0000on-Dj@...>).

Removal of the warning branch. This branch was merged into the 1.2 line in the previous revision (r2575).

The commit message for the merge is located at https://mail.gna.org/public/relax-commits/2006-09/msg00048.html (Message-id: <E1GPwc6-0001uP-1y@...>).

Merged the 'warning' branch into the 1.2 line.

The command used was:
svn merge -r2539:2574 svn+ssh://bugman@.../svn/relax/branches/warning

The merge was discussed at https://mail.gna.org/public/relax-devel/2006-09/msg00003.html (Message-id: <7f080ed10609130743t4e07d46cy213ff84ca1e35ea8@...>).