tigefa4u projects Trac

Fix ''System Information'' in error.html. Follow-up to r4577: don't introduce newlines within a wiki table cell.

Fix the !PlainTextRenderer so that it also works when no annotations are requested. The problem was apparent in code blocks when the highlighter(s) failed to render the block and the plain text renderer was used as a fallback.

Thanks to zimbatm on IRC for helping me to track down the issue.

Follow-up to r4399 and r4597.

Follow-up to r4636, some fine tuning ...

Improve the prepared description text for semi-automatic ticket creation

Clarify `Changeset.get_changes` API documentation. Fixes #4595.

Fix patch renderer unit test broken in [4622].

Simplify `trac.loader` a bit by:
* making use of the fact that SetupTools is now a mandatory dependency, and
* dropping support for plugins not using the `trac.plugins` entry point.
Also, load `.py` source (single-file) plugins after Python eggs (closes #4383).

Fix the `plaintext()` function (which was broken for fragments), and remove the reference to the Genshi `plaintext()` function so that it can be removed from Genshi.

Make the report templates consistent with the other templates.

Remove reference to obsolete `searchHighlight()` javascript function from ClearSilver footer template.