Makes the infrared beams from the infrared devices qdel
assume_air() will stop deleting the air datum if it's rejected
Removed the del(giver) of datum/pipe_network/merge()
Merge pull request #689 from Aranclanos/assumeAir

Aran's lag party: Monkey trouble
Merge pull request #688 from Aranclanos/infrared

Aran's lag party: Infrared beams
GC manually the particles coming from the PA
I'm not making them qdel because all related to the singularity (sparks and emitter beams) don't qdel either, so it makes more sense if these ones stay like them.
Merge pull request #694 from Aranclanos/PAparticlesTakeTwo

Aran's lag party: PA particle beams take two
Merge remote-tracking branch 'upstream/Bleeding-Edge' into 3gbe@vf1
Just check four dir.
Remove redundant update.