Revision 692

DONE	effectiveUser for at least Problem.pm
DONE	write a template escape for printing $user, $effectiveUser, &c. nicely

also added additional timing log points: timing is now logged:

	1. when WeBWorK::PG::new starts
	2. after all the initialization-type stuff happens
	3. when WeBWorK::PG::new ends

Getting it to log the entire request time might be a little harder.
-sam