relax SVN archive

A number of cosmetic changes to the 'error.py' file (addition of comments and removal of spaces).

I mentioned these changes within the post located at
https://mail.gna.org/public/relax-devel/2006-08/msg00082.html (Message-id:
<7f080ed10608292250u3bc0a0b0ud7a319e05ee70f28@...>).

I've added a number of comments to both the RelaxError and RelaxWarning systems. There were also
a large number of empty lines with trailing white-space that I've cleaned up as well. This may make
the merging process a little more difficult.

Changed the introduction string width to be 80 characters wide under MS Windows (the width of
cmd.exe).

Changed the statement float('inf') to 1e300 for portability.

This change fixes bug #6873 (https://gna.org/bugs/?func=detailitem&item_id=6873).

Removed the 'Popen3' class, UNIX only dependency from relax by commenting out two import statements.

This was in response to Daniel Perez's post at
https://mail.gna.org/public/relax-users/2006-09/msg00006.html (Message-id:
<44FB8044.4010400@...). The changes were discussed in my response to the post at
https://mail.gna.org/public/relax-users/2006-09/msg00007.html (Message-id:
<7f080ed10609040003q18ccebe7wf9ab1c1f403d528@...>).

The Popen3 dependance prevents relax from running under MS Windows and hence has been removed.
Although previously broken, the threading code is now definitely non-functional. This will have to
be addressed in the future when someone works on the threading code. I've created task #3629
(https://gna.org/task/?func=detailitem&item_id=3629) for this.

Merged the 'nan_catch_test' branch (r2552) into the 1.2 line (r2552).

The command used was:
svn merge svn+ssh://bugman@.../svn/relax/1.2@... svn+ssh://bugman@.../svn/relax/branches/nan_catch_test@...

This branch was created as a branch off the 1.2 line at r2528. It was in response to bug #6503
(https://gna.org/bugs/?func=detailitem&item_id=6503) and the subsequent discussions in the threads
starting at https://mail.gna.org/public/relax-devel/2006-08/msg00000.html
(Message-id: <7f080ed10608020558o47fd0260s9579f663147ab84@...>) and
https://mail.gna.org/public/relax-devel/2006-08/msg00029.html (Message-id:
<7f080ed10608082240r114cf35an60af62836fcc81bf@...>).

The two functions 'isnan()' and 'isinf()' have been created to fix the bug. These are however not
currently functional. In addition bug #6510 (https://gna.org/bugs/?func=detailitem&item_id=6510)
has been fixed.

Merged r2528 to r2551 of the 1.2 line into this 'nan_catch_test' branch. This is to syncronise the
branch with the 1.2 line prior to merging the branch back into the 1.2 line.

The command used was:
svn merge -r2528:2551 svn+ssh://bugman@.../svn/relax/1.2

Commented out the calls to 'isnan()' and 'isinf()' in the model-free code.

Added a skeleton for the isnan() and isinf() functions. Two dummy functions have been created and
the code in 'specific_fns/model_free.py' now points to these.

Reverted the last changes to remove the RelaxWarning system code which Chris MacRaild has recoded
within the 'warning' branch.

The command used to revert the changes was:
svn merge -r2532:2531 svn+ssh://bugman@.../svn/relax/branches/nan_catch_test

Added a try statement to catch the ImportError failure of the 'lstat' and 'symlink' functions of the
'os' module within the 'sconstruct' script.

This is a fix for bug #6841 (https://gna.org/bugs/?func=detailitem&item_id=6841) which was reported
by Daniel Perez in the post at https://mail.gna.org/public/relax-users/2006-09/msg00000.html
(Message-id: <44F7FFCF.4060102@...>). The sconstruct function problems were identified
by Chris MacRaild at https://mail.gna.org/public/relax-users/2006-09/msg00003.html (Message-id:
<1157109851.28764.964.camel@...>).

This import statement fails under MS Windows as the symlink 'os' functions are UNIX only.