PostSolver.StartEqConstrSysEqConstrSys together with start values to be used.
include Goblint_constraint.ConstrSys.EqConstrSysmodule Var : Goblint_constraint.ConstrSys.VarType with type t = vVariables must be hashable, comparable, etc.
val sys_change : (v -> d) -> v Goblint_constraint.ConstrSys.sys_change_infoCompute incremental constraint system change from old solution.