Minor map fixes/tweaks

- Replaces Brig Medbay Door with a proper glass airlock, currently it
has a full airlock sprite but you can see through it.
http://puu.sh/9KmIv/622c88d639.png
- Gives disposals 2 externals airlocks instead of one, currently it's a
space sentence because of airflow.
http://puu.sh/9KmKO/bacb3bbf0f.png
- Adds missing window in botany backroom.
http://puu.sh/9KmMQ/9eb89f7a14.png
- Adds 2 gas masks in the empty closet in the maint tunnel above
hydrophonics.
http://puu.sh/9KmO2/2069b3bb59.png (well you can't see them, they're in the closet duh)
- Re-adds the missing plasma canisters to engineering secure storage.
http://puu.sh/9KmR1/c070ae473e.png
- Adds the missing wire under the AME door.
http://puu.sh/9KmZH/9b4fb687f9.png
- Deleted all instances of /obj/effect/byondtools/changed.
- Adjusted library carpet and vent to the new front doors, no idea who
added those in the first place but you have shit taste.
http://puu.sh/9Kn2I/4f6f5d2b03.png

Small changes to new EVA layout after feedback from the community:
- Made the floor symmetrical again.
- Got rid of the side doors.
http://puu.sh/9Kmrg/b12a329884.png (Yes I know it lacks like 2 tiles to the right, no I'm not redoing a screenshot)

Also re-added an atmos hardsuit to atmos, making it 2 hardsuits for now.