Backport pool_actively_in_use from BFGMiner 4.0
Differentiate pool_actively_desired from pool_actively_in_use for cnx_needed

Conflicts:
	miner.c
Partial: test_work_current: Cleanup
Modified: Bugfix: Log work updates for all active pools in multipool mode

Continue not-even-debug-logging inactive pool updates

Conflicts:
	miner.c