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I've uploaded a revised version that addresses several suggestions. I think 
we have agreement on those now:
 - Officially ditch smalltable.
 - Comment static storage fields inside PyMemoryViewObject.
 - Improve refcounting in PyMemoryView_FromBuffer()/PyMemoryView_FromObject().
 - Increment mbuf refcount in memory_getbuf().
 - Create separate sections for managedbuffer and memoryview.
Still open:
 - Update documentation.
 - Should PyManagedBuffer be private to this file? Do we need mbuf_new()?
 - Add test to _testcapimodule.c. I wrote a small test for the problematic
 case in PyMemoryView_GetContiguous(), and it indeed returns an unaltered
 view. I suggest that we leave the NotImplementedError for now and handle
 that in a separate issue.
 - Flag handling.