[1.0.X] Fixed #8055: Replaced use of traceback.format_exc (new in Python 2.4)...

[1.0.X] Fixed #8055: Replaced use of traceback.format_exc (new in Python 2.4) with something that works as far back as 2.3.

Thanks to Ramiro for diagnosis and patch. 

Backport of r9770 from trunk.

Also updated svn metadata; all trunk bugfixes have been merged to the 1.0.X branch.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9772 bcc190cf-cafb-0310-a4f2-bffc1f526a37