OOIION-1628

Complete rehaul of datatables filter.  Now everything works as advertised.  You can apply > 1 filter to individual columns, and each operation works (contains, greater, less, etc.).  For the record, everything is compared as strings, but datetime comparisons work fine becuase they are yyyy-mm-dd... .  Also, I'm not sure why GREATER THAN and NEWER THAN (as well as LESS and OLDER) are options since they do the same thing.