Remove log message
New dc listeners approach. No upper bound of sockets. Fix the problem with multiple_dcs_test
Solve conflict with causality_plus_interdc branch
Merge branch 'origin/efficient_propagation'

Conflicts:
	src/clocksi_readitem_fsm.erl
	src/inter_dc_communication_recvr.erl
	src/inter_dc_communication_sender.erl
	src/inter_dc_communication_sup.erl
remove logging messages
fix dialyzer warnings