improved cluster.go, added dummyClusters.go for testing
added cluster/dummySolo*go for testing
further evolution of cluster code, integration into pkt_comms, consensus, peer; gofmt
added MultiClusters, using these in testing consensus and peer
all tests succeed except for two in peer_test.go and a small segment in consensus_test.go
tracking leader in test cluster
much instrumentation
added sleeps in critical places; all tests but one succeed