Reduced logging inside simple edge and vertex providers.
Added checks to vertex and edge selection so that bogus selectionChanged events
are not triggered.
Another log message moving to trace().
Added check so that graph boundary updates do not trigger redoLayout()
unnecessarily.
Deferred setting the layout algorithm until after all Criteria are in place
so that setting focus nodes reduces the time it takes to lay out the graph.
Added a RequestHandler that will reparse focusNodes and szl query parameters
on every request. Fixed some bugs in the code that parses the query parms.