Workers get idle priority.
Removed extraneous import.
Messy hack to kill busy child processes on exit.
Moved workaround code slightly.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/proofofwork.py
	src/shared.py
Trying to enable multicore PoW with single core as a fallback when it's a problem.
Removed an extraneous conditional import.
Merge branch 'master' of https://github.com/Bitmessage/PyBitmessage
Wait for PoW processes to exit before returning a result. Hopefully not needed.
update defaultKnownNodes
Merge branch 'master' of http://github.com/Arceliar/PyBitmessage into Arceliar-master
adjust code formatting
manually merge github pull request: Unicode chars in localtime prevented the gui from starting