#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

by dereine: Improve filter term_node by defining all used variables, removed unused variables and document much more stuff.

Issue #1182762 by tim.plunkett: Remove periods in sentences on checkbox titles, as they are counter to UX standard.

Improvements to the filter edit screen. Much better spacing, and styling for single column forms (no operator)

The position of elements on the filter edit dialog now matches the mockups. A few paddings here and there, and we're done.

Rename optional to required (filter expose settings). Kill the division of the expose settings form into left/right, makes no sense in the new UI.

(reorder changelog)

#972620 by dereine: Add an administrative title field for all handlers to make it more possible to distinguish similar fields from each other in the UI.

#477984 by demeritcowboy, fatstar415, mike dodd, dagmar: Properly handle value for "empty" and "not empty" special operators.

#667950 by merlinofchaos, bojanz and dereine: Revert the states patch and use ctools dependency instead.