relax SVN archive

Fixed some indexing statements in the Open Source infrastructure chapter which were resulting in the
indexing statement appearing in the manual.

Added a try statement to catch the ImportError failure of the 'kill' function of the 'os' module.

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@...>).

This import statement fails under MS Windows as the 'kill' function is UNIX only.

Move RelaxWarning initialisation till after parsing of command line
arguments.

See: mail.gna.org/public/relax-devel/2006-08/msg00088.html

Further modifications to the Warnings system.

Discussed in thread starting
https://mail.gna.org/public/relax-devel/2006-08/msg00082.html

Shifting of the error and warning system initialisation to being after the Pedantic flag
initialisation but before the command line argument parsing. This removes the problem of the
AllRelaxErrors structure not being initialised prior to the command line argument parsing.

Replaces missing imports in r2540

A warning system for relax.

This is based on the system started in r2532, and is discussed in
detail in the thread starting:
https://mail.gna.org/public/relax-devel/2006-08/msg00071.html

The system is based on the standard Python warnings system.
Warnings are generated with the syntax:

warn(RelaxWarning(args))

where RelaxWarning can be any of the Warning classes defined in
errors.py, and args is an arbitrary number of arguments of
arbitrary type which are used by the Warning class to generate a
meaningful message string.

The system also impliments a --pedantic command-line flag, which
causes all warnings to be escalated to exceptions. All of the
relax warnings are subclasses of both BaseWarning and BaseError,
so the escalated exceptions will be caught by except clauses
based on these types.

A further feature in the current implimentation is to include
an exception-like traceback in the warning message when in
debug mode.

Creating a new branch for work on the RelaxWarnings system

See discussion in thread starting:
https://mail.gna.org/public/relax-devel/2006-08/msg00071.html

Rolling back revisions 2535-2537

See discussions in the thread starting:
https://mail.gna.org/public/relax-devel/2006-08/msg00052.html

Modified the sys.exit() statements to return 1 to the shell to indicate failure.