Add the Ability to Inverse any Filter inside the Filter Creation Modal

[lgroschen]

Add the ability to select a checkbox to invert or "not" a filter to allow better table manipulation and to create a feature parity with NSTI 1.4.

Bug from this Nagios Support Forum topic:
http://support.nagios.com/forum/viewtopic.php?f=22&t=28137

[hedenface]

Added to 3.1.0. We'll get to it in a bit.