Create more filter options in DROID csv handler. e.g. remove specific URI types.

[ross-spencer]

The code below enables the removal of FILE URI types.

     if self.includezips:
        newlist = []
        for d in droidlist:
           if droidcsvhandler.getURIScheme(d['URI']) != 'file':
              newlist.append(d)
        droidlist=newlist