- Committed SuperSayu's patch fix for silicon alarms.

- Made the singularity not move stuff while contained, should help and make it easier to work with; such as fixing the field generator.
 - Added logging for gold slime extracts.
 - Removed unneeded deletion of signals in telecomms code.
 - Added a debug verb which will record pointers of signals that weren't garbage collected.
 - Removed the need to create a mob to compare it in telecomms code.
 - The spider infestation is more likely going to spawn nurses.
 - Runtime fix with spells. 
 - Reverse list actually does something now. Bots never needed it so I removed it. (Thanks carn)
 - Added an ON_BORDER flag for border firedoors.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5601 316c924e-a436-60f5-8080-3fe189b3f50e

code/datums/spells/projectile.dm

@@ -57,6 +57,9 @@
 					else
 						step(projectile,dir)
 
+				if(!projectile) // step and step_to sleeps so we'll have to check again.
+					break
+
 				if(!proj_lingering && projectile.loc == current_loc) //if it didn't move since last time
 					del(projectile)
 					break