Fixes #74, Trace all write properties of HTMLElements in the target element menu action.
Pass the functionURL from the eventInfo thru to ElementQueryProvider,
Use the functionURL to find the formalParameters of the event handler,
Attach the element query results to the formalParameters.
Set the tokenTree to the last traceQuery.tree when we update the page,
so what ever query was just requested will show when the reproduction
is complete.
Consequently queries all need a tree, added targetTree().
Removed currentTree from extractTracepoints: not needed.

Test case for issue #74,
add mouseOverSelector test operation by refactoring click,
add classes to some elements to aid selectors.