Check all boxes at once

[topher1kenobe]

I find it tedious to check all the acceptance boxes every time. It makes sense though that you should have to agree every time. I'm thinking a box at the top or bottom that selects all, but ONLY for submitters with a high submission number. Something like 30 or 40. They're obviously committed, and they've checked those boxes many times before.

[coffee2code]

In 12110:

Photo Directory, Uploads: Allow users with 30 or more published photos to bulk check the submission checkboxes.

Props topher1kenobe, coffee2code.
Fixes #6239.

[coffee2code]

In 12111:

Photo Directory: Add style for checkbox toggle.

See #6239.