Updated MetaStation v27G-IV.dmm to MetaStation v28M.dmm

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.
-A few other changes.
-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

![13-06-19 00-16 v28m 800](https://f.cloud.github.com/assets/3833444/672140/efba8cdc-d870-11e2-924b-5487f07c4822.png)