tigefa4u projects Trac

Another r5672 fix: the diff switcher function was not properly namespaced.

Follow-ups to r6572: tabs were introduced, convert them to 2 spaces.

jQuery 1.2 introduced the `.offset()` method, use it.

Improved usage of local pools in `SubversionRepository._history`.

This happens to be the same logic than the one used in the `svn_repos_history` function that [4710] replaced.

Should contribute to reduce the overall memory usage (related to #6614).

Perform explicit garbage collection after every request.

Though there's for sure a performance cost, this dramatically reduces the memory consumption. See #6614 for details.

Follow-up to r6591: forgot about the checkwiki script...

Clarify the TracIni documentation for the `[trac] mainnav` and `[trac] metanav` entries. I also took this occasion to add the TracNavigation page to the documentation.

Fixes #6865.

Testing: twill-0.9 was released, and works for us. It includes the twill patch
we had here, so drop that.

Testing: Merge through [6582] from trunk. All tests pass.

Testing: Merge through [6581] (excluding [6538]) from trunk. All tests pass.