[b-re-w]

Closes #149

• memoryview[float] / memoryview[int] params take the zero-copy buffer path (exact memoryview, 1-D, C-contiguous, d / q / l). Out-of-range raises memoryview's IndexError text. A released, read-only (when stored to), non-contiguous, 2-D or other-format view deopts.
• array.array and numpy were already done (TypedPython: zero-copy buffer-protocol arrays (array.array, numpy, memoryview) as ArrayParam #149 step 1, TypedPython: numpy array parameters (types, warnings and division follow numpy scalars) #220). This adds tests that a resize (append, extend, pop) or a release() from another thread during a call raises BufferError.
• SPEC: concurrent writes from another thread are unsynchronised, as in CPython. Only whole-element access is guaranteed.
• benchmarks/typedpython/py/buffer_calls.py: a call-heavy kernel over list, array.array and memoryview. Only the file is added: it is not measured yet and not registered in run.py.

Tests: test_buffer_memoryview.py has 38 tests. It is red against develop (28 failed) and green here. A mutant without the memoryview IndexError text fails 4 of them. test_buffer_arrays: 61 passed. test_buffer_numpy: 69 passed. test_verify: 220 passed. Existing benchmarks: no memoryview annotation, so their compiled set is unchanged.