Refactored combOpt to contain a graph subpackage (work in progress, but
is correct)

Added support for directed graphs, subgraphs, etc.

M

Added access to dual variables to BasicLpSolver (and down the stack)

Added an LP based max flow min cut to comb opt.

Added a User Cut Callback using max flow min cut to TSP.
Missed a few files by accident.

Added logging for java MIP solver to show progress towards solution to
standard out (num nodes, best bound, incumbent, cuts, etc)

Added some simple branching rules.
Moved and renamed connected components test.