Rename Transport.pause/resume to pause_reading/pause_writing. Also relax timeout in test_call_later().

source.

- don't call PyErr_NoMemory with interpreter is not initialised
- note that it's OK to call _PyMem_RawStrDup here
- don't include this in the limited API
- capitalise "IO"
- be explicit that a non-zero return indicates an error
- include versionadded marker in docs

Previously, the -R option would be specified multiple times
if PYTHONHASHSEED was set.

Order of search is now:
  1. Try getattr
  2. If that throws an exception, check __dict__ directly
  3. If still not found, walk the mro looking for the eldest class that has
     the attribute (e.g. things returned by __getattr__)
  4. If none of that works (e.g. due to a buggy __dir__, __getattr__, etc.
     method or missing __slot__ attribute), ignore the attribute entirely.

I'll make sure and include them in future patches.

Fix inaccurate versionchanged tag for compressobj(): most parameter were there, just got kwarg support.

Patch by Zero Piraeus.

This new pre-initialization API allows embedding
applications like Blender to force a particular
encoding and error handler for the standard IO streams.

Also refactors Modules/_testembed.c to let us start
testing multiple embedding scenarios.

(Initial patch by Bastien Montagne)

Skip tests for 24-bit wave file on big-endian platforms.

Skip tests for 24-bit wave file on big-endian platforms.