An experimental LPSolverWrapper class which uses glpk. For a short
demo, max flow problems are solved with it. This demo does not
demonstrates, but the main aims of this class are row and column
generation capabilities, i.e. to be a core for easily
implementable branch-and-cut a column generetion algorithms.

./preflow_demo_leda < $1

./preflow_demo_boost < $1

./preflow_demo_jacint < $1

./preflow_demo_athos < $1

./edmonds_karp_demo < $1

./edmonds_karp_demo_alpar < $1

./edmonds_karp_demo_boost < $1