tigefa4u projects Trac

WebAdmin:
* use entry points instead of `trac_plugins.txt` file.
* update copyright year
* use utf-8 for file encoding
* bump up version number to 0.1.1

synched the unicode branch with trunk.

''versioncontrol'': `SubversionRepository.oldest` now correctly supports scoped repositories. Closes #2572.

make patch viewer ignore all content between diff blocks to support variations like the `svk diff` output

Trac release for debian 0.9.3-1

Increment version number.

Taggning trac-0.9.3

Added the 0.9.3 changelog entry to trunk.

Reparing for release.

wsgi: convert header values to strings for better WSGI gateway compatibility