FixedShapedSolver #76
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Adds two types of solvers:
FixedShapedSolver. This solver is more memory efficient, but only works on fixed shaped trees. It enumerates all solutions of a fixed shaped tree by (re)assigning the values of holes. To achieve this, it uses a new fixed shaped hole type with stateful domains.GenericSolver. This solver has more flexible state management. It treats each state as an independent propagation program. Iterators can usesave_state!andload_state!to switch between states at any time.