tigefa4u projects Trac

TracCrossReferences: the wiki syntax for creating relations is now provided by the !XRefModule.

Also, it is now made optional and has to be enabled by the following TracIni setting:
{{{
[xref]
semantic_wiki = true
}}}

TracCrossReferences: merge with log:trunk@...:2536

Also, removed some remaining bits from TracDiff.

Provide configurable MIME encoding support for e-mail notifications:
* Base64 (default)
* Quoted-Printable (recommended for western european language)
* No encoding (UTF-8 to ASCII translation)

Correctly interpret property changes occurring on the `repository_dir`. Should fix #2369.

Preparing the new Subversion test repository in order to be able to add unit tests for #2369

New notification implementation to circumvent UTF-8 encoding issues
Fixes up svn:ignore properties

Ported r2529 to 0.9-stable. Closes #2358.

Ported r2525 to 0.9-stable. Closes #2329.

Applied r2524 to 0.9-stable (as announced in TracStandalone documentation).

TracCrossReferences: fixed usage of `delete_links` when deleting a report. Thanks to Emil Kroymann for pointing this out.