One more test: the number of blocked messages is checked.
Small bug corrected.
Junit tests instead of main functions.
Improved test MessageWithHeaderTest.
A test we can try on th cluster
test simplified
A version that we can test on the cluster.
An annoying bug (index of type VertexKey is 0, and not 1).
Tests needed
multicast 0 and 1 are comparable (wrt running time).
Finally: multicast 1 won against multicast 0.