ENH: rewrite PEP 3118 interface without adding items to structs

Implementing PEP 3118 is somewhat convoluted because of the desirata:

- Don't add new members to ndarray or descr structs, to preserve binary
  compatibility. (Also, adding the items is actually not very useful,
  since mutability issues prevent an 1 to 1 relationship between arrays
  and buffer views.)

- Don't use bf_releasebuffer, because it prevents PyArg_ParseTuple("s#", ...)
  from working. Breaking this would cause several backward compatibility
  issues already on Python 2.6.

- Behave correctly when array is reshaped in-place, or it's dtype is
  altered.

This commit works around these issues by keeping copies of buffer format
strings and shape/stride information in a global dictionary. Elements in
the dictionary are reused when possible, and cleared when an array is
deallocated.

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