tigefa4u projects Trac

* Added attachment change listener and validation extension points.
* Added exceptions specific to each of the wiki, ticket and attachment validators.
* Wiki manipulator now actually walks the page validator return values correctly.

Improve `title` of ticket timeline event entries in RSS feeds. Fixes #2070.

The `wiki_to_*` functions now always return a `Markup` object.

Stylistic change: ticket status is now more prominent. Closes #1990.

Timeline ticket events now link precisely to the corresponding ticket change.

Finalizes #3259, proposed by athomas.
I think this could also help for #2760 w.r.t to tickets.

Some more ticket ''Reply to'' feature tweaks:
* added the ability to reply to the main ticket description.
This is mainly interesting for citing part of the original description.
* some Trac developers were not that found of the auto-hide ''Reply'' button,
so I've changed that to a normal button, as less obtrusive as I could make it.

sqlalchemy: oops, r3392 was actually [source:trunk@...]. Sync with [source:trunk@...] for real this time

sqlalchemy: sync with [source:/trunk@...]

Make the patch renderer a bit more robust, like when the line is missing between two consecutive diffs (see attachment🎫1890:authen.diff for example)

Fixed silly mistake in r3388