Exclude Py3.3 from appveyor builds as it is out of maintenance anyway and isn't really supported by external packages anymore.

Update Coverage.py 

remove deprecieated import in Coverage.py

Generalise .so file regex even further as the platform suffix of extension modules can be arbitrarily complex in Py3.5+.

append to list
use _get_actual_filename also for file_reporter() and file_tracer()

use filepath with the correct upper and lowercases

Fix classmethod creation for (upcoming) PyPy{,3} 5.9

Make some dealloc behaviour depend on "tp_finalize" slot usage and not just Python version because it depends on the time when the finalisation is executed (during or before dealloc).

This reverts commit 53327193.

Fixes Github issue #1886.

Closes #1879.

Disable PEP-489 support by default (*sigh*).  It actually requires more than Cython currently implements: sub-interpreter support and reloading support, i.e. per-interpreter module globals/types/state.
Closes #1894.