This parameter is only evaluated when solving an LP with a concurrent solver (Method = 3 or 4). It controls which
methods are run concurrently by the concurrent solver. Options are:
-1=automatic,
0=barrier, dual, primal simplex,
1=barrier and dual simplex,
2=barrier and primal simplex, and
3=dual and primal simplex.
Which methods are actually run also depends on the number of threads available.