Filters for the triggered events interface, and support for items instead of patrons...

Filters for the triggered events interface, and support for items instead of patrons as an entry point (just need to wire that up).  Lists and streaming rows can be brittle if the lists are cleared while data is still streaming in.  I've tried to fix that by disabling the buttons until an oncomplete is encountered, but it's still brittle.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@14889 dcc99617-32d9-48b4-a31d-7c20da2025e4