(PWR) Sleek Scales morale-effect buff, Tail fixes

Buffs Sleek Scales (now provides positive morale when drenched), fixes http://smf.cataclysmdda.com/index.php?topic=4572.msg68435#msg68435 , and cleans up a fair amount of tail and eye loopholes.

Compiles and runs fine; tested and Thick Tail whaps as intended, Sleek Scales help out, and all should be well.

Pull when ready, please.