Large hydroponics update:

Changed: Larger hydroponics vat, wheat sprites.
Added: Weeds (4 growth stages + dead), harebells (growth stages + dead), nettles and death nettles (5 growth stages + harvestable + harvest=weapon + dead + seeds), Weed-B-Gone (sprite + item left&right hand sprites).

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@38 316c924e-a436-60f5-8080-3fe189b3f50e

code/game/machinery/hydroponics.dm

@@ -1,7 +1,7 @@
 /obj/machinery/hydroponics
 	name = "Hydroponics Tray"
 	icon = 'hydroponics.dmi'
-	icon_state = "hydrotray"
+	icon_state = "hydrotraynew"
 	density = 1
 	anchored = 1
 	var/waterlevel = 100 // The amount of water in the tray (max 100)