Master dijetmatcher 2

Merged Peter Sherwood requested to merge peter/athena:master-dijetmatcher-2 into master

MaximumBipartiteGroupsMatcher uses a flow network to perform matching. The number of network configurations is now > 1, and the construction of these networks has been moved to dedicated classes. MaximumBipartiteGroupsMatcher can now be configured to use different networks.

@peter @khoo @ckaldero @jbossios @sschramm @cantel

Edited by Peter Sherwood

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