MAINT: Use PySlice_GetIndicesEx instead of custom reimplementation

This has the side effects of:
- changing several IndexError exceptions into TypeErrors
- allowing slices like `arr[False:True]` as equivalent to
  `arr[0:1]` (because now we're using Python's logic for interpreting
  slices, and Python is happy with treating bools as integers in integer
  contexts).

It also deletes almost 100 lines of code :-).

While I was at it I also cleaned up some buggy uses of
PySlice_GetIndices (which is pretty broken -- e.g. the code was assuming
that it sets an exception on error, but this is not true! the Python
docs explicitly recommend that you never use it.)

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