Display more info in the "event" filter (date, event ID)

Problem: The event filter in reports typically shows only the event titles, sorted by end_date. When an organization has many events, it can be hard to find the right event in the "event" filter in a report. This is especially problematic if many events have identical or similar names, so that they're distinguishable only by start date and/or event_id.

Proposed solution: Appended the start date and the ID to the filter option labels, and sorted them alphabetically by title.

Technical challenges: The "event" filter is defined on a per-report basis, and it even seems hard to grep the codebase to find them all. This fix will require finding them and fixing in each report class file.

Reference this forum post: http://forum.civicrm.org/index.php/topic,26249.0.html