tigefa4u projects Trac

TracCrossReferences branch: some renamings
* `s/dst/target/`
* `s/dest/target/`
* `s/destination/target/`
* `s/src/source/`

Note: if you already had a `xref` table, simply do the following in sqlite:
{{{
#!sql
drop table xref;
update system set value='13' where name='database_version';
}}}
Then, using `trac-admin`, do an `upgrade` and an `xref`.

PS: also fixed the upgrade process (one statement at a time)

add .vb to the recognized extensions for Visual Basic highlighting (fixes #1711)

When upgrading an environment, a sample configuration file is written
besides the `trac.ini` in the `conf` folder.

This makes it easier for Trac administrators to manually add
the new configuration settings in the existing `trac.ini`.

It will be particularly useful for the 0.9 release, since
TracIni has evolved quite a bit since the 0.8 version ...

add enscript highlighting for Lua (fixes #1711)

Add line break before the 'replace' option on the new attachment page. Closes #1919.

Restore correct MIME type for report RSS feed that was accidentially changed in [2166].

* HTML-escape project name in title. Fixes #2000.
* Renamed HDF variable `project.name.encoded` to `project.name_encoded`. See #1915.
* Some fixes and cleanup to the report RSS feed.

Implemented wiki syntax for revision ranges.

Both `r2160:2164` and `[2160:2164]` can be used.
They will point to the Revision Log view for that range.
As such, there are similar to the log:#2160:2164 syntax.
The latter is more powerful, though, as one can restrict
the view to a given path (e.g. log:branches#2160:2164).

This closes #1259.

Setting req.hdf to None in RequestDispatcher did break out "pretty" error messages.

TracCrossReferences: modified the `TitleIndex` macro so that it also shows the count of backlinks