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all, this crashes.  Not 100% sure why.

fix: must be ready for the _pinned_objects list to contain both RPython and LL objects at the same time, for some tests

and make the hack more local to pypy/module/bz2.

o match CPython's TypeError behavior w/ rich comparisons & number types

Split RPython documentation from PyPy documentation and clean up.  There now is
a clearer separation between documentation for users, developers and people
interested in background information.

This branch adds an interface rgc.pin which would (very temporarily) make
object non-movable. That's used by rffi.alloc_buffer and
rffi.get_nonmovable_buffer and improves performance considerable for IO
operations.