Set particles to noClip. Performance improvement.
Merge remote-tracking branch 'upstream/MC-1.4' into routingUpdate
replacing _routeCosts with a list

_externalRoutersByCost is just a copy of _routeCosts, so have
CreateRouteTable just make the right sorted list to begin with -
concurrent access is handled by just handing out a pointer to a list
that is never modified.

IRouter.getRoutersByCost was modified to accept any list, because there
is no reason to actually use a linkedList, as it is neither created, or
modified randomly.

also, added in the _myPipeCache pipe cache - passing items to a
non-ticking pipe seems to have no effect (i walked in and out of range
of my pipe network several times, and it didn't seem to have any effect;
(nothing miss-routed that i could see, nothing in the error log, no
items dropped), but has not been tested SMP.
Merge pull request #340 from AartBluestoke/routingUpdate

Routing update - major server efficency improvements