tigefa4u projects Trac

In roadmap and milestone view, also provide a summary of the total count of tickets, and a link to all tickets for the milestone. Implements #3233.

0.10.4dev: ported r4532-4533 to 0.10-stable (''trac-post-commit-hook, #1310 and #1602'')

Follow-up to r4532, remove my own settings

trac-post-commit-hook enhancements from markus. Fixes #1310 and #1602.

TracMercurial for 0.11: follow-up to r4530. The plugin is now compatible with the upcoming IPropertyRenderer interface. It will also stay compatible with the old `Changeset.get_properties` API until 0.11 gets released.

Property renderer branch: reimplement #2545 to use IPropertyRenderer

This modifies the return type of `Changeset.get_properties` in a backward incompatible way.

The `mode` used in IPropertyRenderer for rendering revision properties is `'revprop'`.

In order to make it easier to quickly get some useful rendererings, I've added a `WikiPropertyRenderer`, which learn from the TracIni file what properties could be rendered as wiki text:
{{{
[browser]
wiki_properties = trac:description
oneliner_properties = trac:summary
}}}
(note that the above correspond to the defaults).

Besides, a few additional changes in the templates have been made so that the Changeset view now validates.

Property renderer branch: a few improvements for the `SubversionPropertyRenderer`
- `svn:externals` targets don't necessarily need to be configured when using the http: protocol, but the revision information is then ignored.
- support for `svn:needs-lock` added

+ a small bug fix for the rendering of added properties in the changeset view.

Property renderer branch: a few bugfixes that I forgot to integrate properly in the other changesets
- more informative display of svn:externals properties for which no mapping is defined
- fix display of deleted properties in changeset view

Property renderer branch: add a `SubversionPropertyRenderer` which knows how to render the `svn:externals` property (#2340).

This renderer reads a `[svn:externals]` section in the TracIni, which looks like this:
{{{
[svn:externals]
http://ourserver.ourdomain.com/svn/eng-soft http://localhost:8000/devel/browser/tags/$path?rev=$rev
svn://dserver/support_repository http://dserver/trac/support/source/$path?rev=$rev
}}}

That way, the configured `svn:externals` entries will link to the right place in other Trac (but the URL can point to other servers, like ViewVC or directly in the Subversion server through the http: protocol).

Property renderer branch: add IPropertyRenderer and IPropertyDiffRenderer interfaces

This also provides default implementation for those interfaces, which reproduce the current behavior, except for the default `DefaultPropertyDiffRenderer` which implements #3002 (view difference of multi-line properties as rendered diffs).

In order to implement the above, a few changes in the `PatchRenderer` were needed.

Also, the `.revision` property of the WikiContext which was added in the blame branch was also needed here, so I ported that part of r4483.

The main ticket for this is #1601.