Nerfed EMP's against augmented limbs

Because there's not much benefit to only having a few limbs augmented,
and 120/60 damage just silly.  For comparison, cyborgs take 20 damage
total from an EMP and 5-10 stun, and humans take 60 brute damage for
being just outside the gibbing range of a bomb.

This PR brings the average damage from a strong EMP to an aug down to
48, and from a weak EMP down to 30.  The stun against a full aug is
still very likely to be around 10 or 5, respectively.  This is on top of
having weapons drained, headsets disabled, etc.
DME fix

Whoops
Merge branch 'master' into idedplsnerf
Consistentification

Sticking with the high-end of damage, for lack of strong opinions.  Also
removed false claims of certain procs' being in human_defense.dm, and a
useless emp_act override in ion rifles. (All EMP's are 1 or 2 severity)
New robotic limb emp message

Now with more immersion
Merge pull request #2885 from AlexanderUlanH/idedplsnerf

Rebalanced EMP's against mobs