Make sleepy pens adjustable doseage

[UrsulaMejor]

If you know enough chemistry sleepypens are so ridiculously good for a 4 telecrystal purchase that making them better might literally blow the servers up IRL

Also it's two clicks to dump a full pen into someone, if you're in the position for one subtle dose you can sure as hell pull off two.

sometimes I only want to inject 1 unit, though. See: Stable Mutagen and some random guy's blood.