ZomgPonies/Paradise — pull request #377 by Bone-White (2014-08-11 16:49:05+00:00)
Title: Further atmos changes

mixers and filters no longer have density = 1, so mobs can walk over
them.
new item: pipe freezer, can temporarily freeze pipes to allow
unwrenching when over the threshold internal pressure
note: has a temporary skin of hand labeler, needs a new sprite really.