various new features:

80 commits, +2100 -900 lines of code.
crafting load balanced, jobs distributed between all pipes of equal priority.
providing load balance - pipes without backlog are preferred. (also for crafting, but the above generally overrules this.)
send balancing - senders(qsorts, extractors) will not strongly over-stuff inventories any more.

Mod-sink is now a the lowest priority except for default. (#559)
this means that you can terminate stuff before it gets to the mod-sink, and bees will be analyzed over a forestry or extra-bees mod-sink.

Compatibility fixes against latest git-bch (backwards comparable) and gregtech (NOT BACKWARDS Compatible), 

Crafting recipe added to upgrade extractor mk 2,3 to advanced extractor mk 2,3

Further significant cpu improvements, especially to the crafting tree (thanks ArtForz), or handling stacks in inventories.
For best performance use both this LP and the git BC, or a version greater that 3.4.3 (not released as of 2012/02/26).

BugFixes:
SEVERE: chassi crash with modules but no inventory resolved.
SEVERE: crash on load due to NPE in EntryRoute comparison probably resolved.
SEVERE: multiple providers in a chassi do not cause crashes - #546
firewall pipes now update their routers when you update their settings, should resolve #567
several cases of concurrentModificatoin, or NPE when threaded chunk-ticks are enabled
breaking a pipe now aborts outstanding requests at that pipe.
qsort behaves a bit better.
Items bouncing off full inventories behave much better.
breaking crafting signs will *probably* not drop dummy objects any more.