CS2 v4.3 modified to be used as a min-cost flow solver inside
the Social Network Distance, Anonymized.

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CS2 version 4.3, 3/5/06

Version 4.1 removes push lookahead to fix a bug in 4.0
Version 4.2 fixes a bug in optimal dual computation
Version 4.3 makes the code compile under cygwin (Windows) as well as Linux
