New tools function DateBeforeToday

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9867 5227b50d-9349-4574-b055-4b0a7525e11c
For https://en.wikipedia.org/wiki/Wikipedia_talk:AutoWikiBrowser/Bugs#Recommend_creating_a_more_graceful_failure
Validate that expiry date on page protection is not a date in the past

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9868 5227b50d-9349-4574-b055-4b0a7525e11c