tigefa4u projects Trac

WSGI branch: when the `TRAC_ENV` variable was setting when running tracd, only a single project would get served under the root URL.

Fix bad usage of the ticket API in contrib script `emailfilter`. Closes #2255.

WSGI branch: some fixes for [wiki:TracStandalone tracd] and multiple environment handling.

sort report rows using the "sorted" method to make it handle any sequence, not just lists (fixes #2830)

Updating the diff options was not working in the case of a generalized diff, due to a wrong query parameter name.

VcRefactoring: merge changes from [log:trunk@...:2944]

use '/' instead of '_' for escaping SQL LIKE wildcards since SQLite doesn't work with '_' as the escape character (fixes #2759 for real)

WSGI branch: renamed `HttpException` to `HTTPException`, and use upper-case `HTTP` for the various exception subclasses.

WSGI branch: sync with trunk@...

handle report variable substitution inside arbitrary literal strings and escape "%" characters used inside SQL literal strings to avoid parameter replacement problems (fixes #2773)