Support Dim 2/1 and Fix Bug #26

Job	Run time
serial (-DUSE_PYBIND11=ON, pybind11)	59s
serial (-DUSE_PYBIND11=OFF, pure_python)	48s
parallel (-DUSE_PYBIND11=ON, pybind11)	8m 39s
parallel (-DUSE_PYBIND11=OFF, pure_python)	6m 36s
	17m 2s

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