Canister Ex_acts

-Gives canisters a unique ex_act. Previously, they defaulted to machinery/ex_act, which just deleted them entirely, including the gaseous contents.
Merge branch 'master' of https://github.com/tgstation/-tg-station
Fixed chem smoke not waiting for other reagents to mix before reacting and then clearing the contents; often causing instances where that dangerous poly grenade only gives off Sugar.
Redo of zone_sel/Click() to be much simpler. Zone_sel is the paper doll on the screen where you choose what body part to target. Fewer sections under switch statements, plus a check to only update the icon if there's been a change.

tgstation.dme is a fixed version without FILE_DIR set. Gitblame!
Show Server Revision displays if Latejoin Antags are enabled, like Protect Authority Roles
Improved logging of syndicate bombs and grenades
Standardized spelling of all instances of "Centcom"

Centcomm/CentComm -> Centcom
centcomm -> centcom
Admins get notified when someone replies to a syndicate transmission.
Updated MetaStation v27G-IV.dmm to MetaStation v28M.dmm
-Improved layouts of Medbay, Research and Supply departments
-Added large test chamber to Xenobiology.
-Tinted a great deal of windows to make life easier for traitors
-More snack machines, but all are public and so a little more risky, but this should help encourage more player interaction.
-Fixed problem with syndicate shuttle doors.
-Added internal tunnels to singularity arms.
-Made more airlocks viable for spacing people.
-Fixed lots of small bugs

Maptools used, of course. Please give feedback here if you can, pictures are also in this link:
http://www.spacestation13.net/phpbb/viewtopic.php?f=6&t=358
Merge pull request #805 from Ikarrus/syndiereply

Admins get notified when someone replies to a syndicate transmission.
Merge pull request #803 from Ikarrus/centcom

Standardized spelling of all instances of "Centcom"
Merge pull request #802 from Ikarrus/getrev

Show Server Revision displays if Latejoin Antags are enabled
Merge pull request #811 from Metacide/master

Updated MetaStation v27G-IV.dmm to MetaStation v28M.dmm
Merge pull request #748 from Cheridan/master

Canister Ex_acts
Merge pull request #776 from Giacomand/chem_smoke_fix

Fixed chem smoke not waiting for other reagents to mix before reacting a...
Merge pull request #798 from MrPerson/zone_sel

Redo of zone_sel/Click() to be much simpler.                                                             Zone_sel is the paper doll ...
Merge pull request #801 from Ikarrus/bomblog

Improved logging of syndicate bombs and grenades
Merge branch 'master' of https://github.com/tgstation/-tg-station into bombtweak
Fixed syndie bomb inhands being on the wrong hands