Add search options for "match case" and "match whole word"

[eblot]

The search feature is sometimes hardly usable.

For example, searching "UNC" on trac.edgewall.org returns hundreds of hits, most of them being matched from the "function" word.

It would be very useful to add common search options such as "match case" and "match whole word".

[cboos]

Part of the AdvancedSearch fUNCtionality ;-)