Solves a runtime when someone tries to mop up blood.

proc name: afterattack (/obj/item/weapon/mop/afterattack)
  source file: mop.dm,45
runtime error: undefined proc or verb /obj/effect/decal/cleanable/blood/tracks/footprints/clean().
Map fixes - Vacuum Removal

A number of tiles seem to have inherited settings which are now inappropriate.
Removing these even though the pressure difference between these near-vacuum and standard pressure areas could cause hilarious injuries at round-start.
Merge pull request #7109 from Ccomp5950/mop_fix

Solves a runtime when someone tries to mop up blood.
Merge remote-tracking branch 'upstream/master' into dev
Merge pull request #7118 from PsiOmegaDelta/dev

Dev