Cephalopod branching

Nothing hugely special, just gives Cephalopds some separate traits (the
eyes include Nicitating Membrane & Bulging, and the vision is pretty
much FNV with extra Glare penalties).
Rat love

Improves Rat branching (muzzle, broke out whiskers, new claws, condensed
metabolism) and provides some higher-end mutations for 'em (nastier
claws, bite, burrowing).

Capstone post-thresh payoff ATM is being able to eat through walls, no
pickaxe required.

Thanks to Rivet for helping sound out the wall-breacher.
Lizard limb-regen

Benefit to one of the first post-thresh categories: if you splint your
broken limb, its chance of recovery is 20x faster than normal.  If you
*don't* splint it, you still get some chance, just the typical two-week
period.
Fix typo.  Thanks, Lain.
Timechecks!
Fix strings.
Merge pull request #9714 from KA101/muts

Pre 0.B mutations