Added "hide" verb to mousetraps, placing them on the same layer as hidden mice.

Triggered mousetraps and dead mice will be moved back to the top layer.

Monkeys will no longer move randomly while being pulled.
Two config variables added - disable_player_mice and uneducated_mice. The first, if enabled, prevents players from spawning as mice, and the second, if enabled, prevents mice from understanding human speech (which they now do my default)

universal_understand = 1 now allows player-controlled mobs to understand what everybody is saying without necessarily allowing them to talk back intelligibly. Mice have universal_understand = 1 by default.
Removed two variables accidentally copied over from dev
Merge pull request #4070 from RavingManiac/master

Crouching monkey, hidden mousetrap
Simplified the monkey pulling check as per Giacom's suggestion.
Merge pull request #4083 from RavingManiac/master

Simplified the monkey pulling check as per Giacom's suggestion.
changes pushed to master branch instead of dev
Merge pull request #4086 from Ravensdale/player_age

Player age restriction tweak
Fixes issue #4062 (Chaplains door to coffins improperly layered)
Reattaching a mindless head no longer results in a runtime error
Merge pull request #4090 from alex-gh/head_reattachment_runtime_fix

Fixed runtime when reattaching a mindless head.
Fixes #4075
Cannot turn around while unconscious or dead now.
Merge pull request #4091 from Miniature/master

Fixes issue #4062 (Chaplains door to coffins improperly layered)
Merge pull request #4094 from comma/master

Fixes #4075
Fixed tile in sec dormitories being in wrong area
might have been related to issue #4043
Fixes Power Grid checks killing the AI's SMES.

Added the turrent protected check to restore_power() that is already in power_failure()
Merge pull request #4102 from Ccomp5950/ai_grid_check

Fixes grid_check events killing AI's SMES.
Vending Machine PIN fix.

Removed requirement for PIN on vending machines with an easy way of adding it back in the future
or setting machines to not use it or use it depending on what we decide later on.

Someone attempted to make it where it would accept any PIN and this is just as annoying as typing in a PIN.

So...space communism, swipe your card and it spits out an item.  No PIN prompt at all.
Derp fix.  Checked the reattach head surgery dm.
Merge pull request #4105 from Ccomp5950/head_reattach_fix

Derp fix.  Checked the reattach head surgery dm.