-Fixed exterior virology access button not working

-Increased brightness of light bulbs to 4 (up from 3). This is so I wouldn't have to spam a whole bunch of light bulbs in darker areas to get the same mood it had before the darkness update. And since I don't need them any more, I've removed a bunch of light bulbs I added in in an earlier commit.
-Added a maint door to the Janitor's closet
-Map changes to library and medbay. Thanks, Dingus!
-Updated changelog

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4324 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/power/lighting.dm

@@ -247,7 +247,7 @@
 				if(prob(10))
 					broken(1)
 			if("bulb")
-				brightness = 3
+				brightness = 4
 				if(prob(25))
 					broken(1)
 		spawn(1)