speed up spot checking

Adds filtering by publication sub types and dates. We also display force publishing stats to aid spot checking.

Not too keen about passing the subtype filter option as string e.g. Press releases, instead of it's ID, but to change this would require refactoring more of the admin filter, as the name is also used for display purposes, and could slow it down doing more lookups.

https://www.pivotaltracker.com/story/show/53339299

Also contains fixes for https://www.pivotaltracker.com/story/show/51968687