Item11209: extra grace period added to the file time checks broke the unit tests. Plus put in exception for running the tests on stores that don't have the RCS style 'pending checkin' complexity

git-svn-id: http://svn.foswiki.org/trunk/UnitTestContrib@16578 0b4bb1d4-4e5a-0410-9cc4-b2b747904278