tigefa4u projects Trac

TracDiff refactoring: use `new_path` instead of `path` for the new path pseudo-argument

TracDiff: fixed buggy browser links in file entry diffs

TracDiff: added the ''Next Change'' navigation link for restricted changesets.

Now it's possible to conveniently browse the sequence of changes for a given path,
in both directions.

TracDiff merged with trunk (log:trunk@...:2775)

TracDiff: merging the `diff.py` file back in `changeset.py`, and the !DiffModule back in the !ChangesetModule (no !AbstractDiffModule anymore)

TracDiff: updated the latest `changeset.cs` so that it can handle restricted changesets and generalized change sets (modification taken from the now obsolete `diff.cs` template)

TracDiff: resurrecting the template

TracDiff: fix for diff and zip rendering (follow-up to r2309)

Use a non-reentrant lock in the connection pool so that we don't return two different connections for the same thread.

Pass authname for changeset timeline event provider for authz support.