wip/scip 9.1.0 NetBSD

SCIP is currently one of the fastest non-commercial solvers for mixed integer programming (MIP) and mixed integer nonlinear programming (MINLP). It is also a framework for constraint integer programming and branch-cut-and-price. It allows for total control of the solution process and the access of detailed information down to the guts of the solver.

Features: * very fast standalone solver for linear programming (LP), mixed integer programming (MIP), and mixed integer nonlinear programming (MINLP) * framework for branching, cutting plane separation, pricing, and propagation * large C-API, C++ wrapper classes for user plugins * interfaces to other applications and programming languages * open LP solver support * highly flexible through many possible user plugins