tigefa4u projects Trac

Use a more transparent method to avoid building the authenticaton, session and chrome data for requests that don't need them: the `Request` object now supports specifying callback functions that are called when undefined request attributes are accessed. The request dispatcher provides callbacks for `req.authname`, `req.session`, `req.hdf`, etc, so that those are evaluated lazily.

Decouple `env.href` and `env.abs_href` from the current request, and instead base them on the `base_url` option in [wiki:TracIni trac.ini].

Fixes a few glitches in the Genshi Roadmap and Milestone templates. Thanks to Justin Francis for the patch!

SpamFilter: minot tweaks

Add support for displaying list of changesets and ranges of changesets in TracRevisionLog by extending the TracLinks `log:` syntax.

Now, in addition to a single range `[12:23]` which was already supported, one can list multiple ranges like `[12:34,45:50]` (or equivalently `[12-34,45-50]`). Single changeset numbers can also be listed instead of ranges, e.g. `[1,2,3-6,10,11]`.

Further simplification of the TracBrowser's IWikiSyntaxProvider

SpamFilter plugin: Another follow-up to [4079], more fixes in the ClearSilver template.

Follow-up to [4079]: show the full content in the spam log entry detail panel also when using ClearSilver templates.

SpamFilter plugin: add log entry detail view to monitoring admin panel.

Refactoring of the TracLinks `source:` and `log:` resolver syntaxes:
- there's no point to reuse the share the same function between `source:` and `log:` resolver: they already diverge and they're going to diverge more (support of revision ranges in the `log:` resolver)
- fixes remaining `log:` resolver syntax unit-test failures