tigefa4u projects Trac

* More trunk merges, log:trunk:2964:2982
* Added missing checkbox field.

Really fixed standalone.py this time.

Fixed broken usage() help in standalone.py.

unicode: synched branch with trunk@... and fixed #2394.

Ported [2978] to 0.9-stable ''(lessen path_history memory usage)''

Further reduce memory usage during path_history queries (follow-up to r2151).

Thanks to exarkun for the report and bdash for hinting me to the fix.

`trac.util` is now a package. Split out `Markup` class into separate `trac.util.html` module.

Add two methods to the `Markup` class:
`stripentities(keepxmlentities=False)`:: Replaces all character or numeric entities in the text with equivalent UTF-8 characters, optionally keeping the core XML named entities in place.
`plaintext(keeplinesbreaks=True)`:: Strip all tags and entities from the text, and optionally also replace line breaks with regular spaces (replacing the `rss_title` method).

Correctly highlight a search term prefixed by a "!" character. Closes #2718.

A few typos fixes contributed by Andres Salomon, thanks!

Closes #2813 and #2822.