Add a ticket change listener to detect related tickets.  Refs #9648.
Add a ticket change listener to detect related tickets.  Refs #9648.

THIS CONTAINS SOME HARD-CODED FIELD NAMES AND WORKS ONLY WITH
MASTERTICKETS AND SUBTICKETS.  IT DOES NOT YET WORK WITH CHILDTICKETS OR
OTHER RELATIONSHIP PLUGINS.

This doesn't do any rescheduling.  It just notes how many tickets need
to be rescheduled and how long it took to find them.

git-svn-id: 2159781fc7c14c6bdd1f7e265daf7a25099c31e7@12748 7322e99d-02ea-0310-aa39-e9a107903beb

trac-hacks/trac-jsGantt,trac-hacks/trac-jsGantt,trac-hacks/trac-jsGantt