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User can choose from O1-O3, by default it's O2.
O3 is almost the same as previous compilation. Compilation time in O1 is roughly 10%-20% faster than O3, depends on the particular circuit and field config.
There's no O0 mode, since some optimizations are necessary for correctness.
Tao Lu's example code compiles to identical layered circuit for O1 and O3.
This PR should be merged after #147.