This reverts commit 745eb654.

#1396376 by pixelmord: Correct the checking for the default value of content has taxonomy terms with depth

#1367304 by tim.plunkett, dereine: Allow to use arguments with multiple filter groups together. Therefore all filter groups get converted from 0,1 to 1,2 because 0 is made as a special group which has always AND which is then used by the arguments

increase #maxlength for table summary

#1395444 by tipit, andi-d, munnin, sreher: Improve the Advance Help Documentation: aggregation section