relax SVN archive

Converted the Info_box into a singleton.

This will allow for execution specific info to be placed in here and accessed by all.

Fix for the Capturing_exception class.

Sometimes the exc_info does not correspond to an exception (i.e. sys.exc_info() returns None). This
is now caught and the class returns silently. The result is that the true traceback from the slaves
is printed!

A python 3.0 fix for the grace module.

The command used was:
2to3 -w \
> -f buffer \
> -f idioms \
> -f set_literal \
> -f ws_comma \
> -x except \
> -x import \
> -x imports \
> -x long \
> -x numliterals \
> -x xrange \
> relax .

Made Info_box.sys_info() fault tolerant.

All the contents of the platform module are checked before added the text, allowing for older python
versions.

The version-less modules now have an empty string for the version printed.

Added the relax C module compilation info.

Redesigned package_info() to remove the dependence on the pkg_resources module.

This was a problem in many old python versions. The package info is now presented in a table.

Imported os in the os.devnull import check, and deleted devnull.

Added an import check for epydoc.

Made the mpi4py import flag more consistent.