Simplify dynamic memory allocation/deallocation #16
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Use a `cimport` to include `PyMem_Malloc` and `PyMem_Free` directly. Helps shorten expressions where they are used.
Simplify usage of `PyMem_Malloc` by dropping the `sizeof` expression into the argument. Also drop the now unused `len_nd_b`. Should make it easier for the C compiler to inline the `sizeof` result; thus, simplifying the allocation expression.
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Does a little tidying around memory allocation/deallocation. Namely imports
PyMem_MallocandPyMem_Freeintocybuffer.pyxto shorten things a bit. Also inlines use ofsizeofintoPyMem_Malloccalls. Finally drops unused intermediate variables.