Moved css around so that we get a similar look in all pages
Added first idea of statistics page
Added monthListAction to Timecard indexcontroller

This gets the same data as jsonMonthListAction using the same model methods, but
sends valid javascript instead of PHProjekt-specific stuff.
fixup idea
Use real data in the statistics
Re-add the statistics page with a hint that it is incomplete
Remove useless message
Don't allow 24:00 in the client, the server does not understand that.
Make the bookingcreator correctly recognize times like 2200

Because we did not enclose the regex in ^$, the match for 2200 was just 220,
which is 2:20 am.