tigefa4u projects Trac

I messed up and placed a new function inside an existing function.

* Make sure trac.upgrades get installed
* Don't use fancy lamda functions, python2.1 can't handle them.

Added attachment support (both wiki and tickets). This required a schema
change so "trac-admin /path/to/project upgrade" is required.

Refactored ui for Browser, Log and File to make browsing the repo easier and
nicer looking.

Added default image-mimeviewer. Moved mime-guessing code from File to
Mimeviewer. Added silvercity-support for svg and javascript coloring.

Include mimeviewers package. Thanks to Laurie Harper for noticing.

Better mime-type guessing logic.

Added initial file syntax highlightning support (Both for repository files
and attachments).

* Make tracd work again after mimeviewer integration.
* Implemented our own lstrip, rstrip functions so the code works with python2.1.

Added simple mime-based presentation framework. Added SilverCity-viewer used
for syntax-highlighting of sourcecode-blocks in many languages. Fixes #228.