relax SVN archive

Alterations to the debug mode.

These changes reflect the discussion on relax-devel at gna dot org:
https://mail.gna.org/public/relax-devel/2006-08/msg00049.html

Two functions are implimented when in debuging mode:
1) KeyboardInterupt during script execution will print the normal
python traceback
2) The all of the relax exception classes will save the program
state

Created the RelaxWarning subsystem. The standard 'RelaxWarning' and the 'RelaxZeroVectorWarning'
warning classes have been created.

Modification of proposed fix to bug #6503

Based on discussion on relax-devel at gna dot org:
https://mail.gna.org/public/relax-devel/2006-08/msg00033.html

This modification does not raise RelaxError if the amide bond length
is 0, but rather sets the bond vector to None

Fix for the RelaxInfError and RelaxNaNError.

Proposed changes to fix bug #6503 (https://gna.org/bugs/?func=detailitem&item_id=6503) which has
been discussed within the thread starting at
https://mail.gna.org/public/relax-devel/2006-08/msg00000.html.

Made a private branch of the 1.2 line to test proposed NaN catching code.

Modified the release checklist and added an entry for updating the 'Release' field of the bug
tracker.

Updated the manual and changed the version number to 1.2.6.

relax version 1.2.6.

A quick release to fix the fatal 'devnull' ImportError (bug #6403). This bug effects those using
Python versions < 2.4 and prevents relax from starting up. The solution was to import the object
using a try statement to allow execution of the program. However if relax ever attempts to use
'devnull' a RelaxError is thrown, a message saying to upgrade to Python >= 2.4 is printed, and the
program terminates. This is currently only a problem in the test-suite.

The full list of changes is:

Features:
N/A

Changes:
N/A

Bugfixes:
* Added the missing PDB file used by one of the OpenDX tests of the relax test-suite. (bug
#6404)
* Fixed the fatal devnull import failure for Python versions < 2.4. (bug #6403)

Updated the CHANGES file for relax version 1.2.6, the fatal devnull import failure fix.