run do:

	../testbed/testsuite/tbtest run tbdb frontend

but you could also something like do:

	../testbed/testsuite/tbtest init tbdb
	../testbed/testsuite/tbtest test frontend
	# notice that sharkshelf test is broken.
	# make changes
	../testbed/testsuite/tbtest/single frontend sharkshelf
	# note still broken
	# make more changes
	../testbed/testsuite/tbtest/single frontend sharkshelf
	# note fixed.
	../testbed/testsuite/tbtest/finish

Also added a -leavedb command which can be used in conjunction with single
to debug individual tests.  It prevents the removal of the test DB upon
exit.