reimplement PEP 3155 __qualname__ calculation in a dedicated transform to base it on the node structure instead of the scopes (which fails for class scopes)

optimise string equality comparison by always looking at the first character before calling into the C-API

--HG--
extra : amend_source : 65f946184bc3b291289c54f6787aba7d2ad43b20

--HG--
extra : amend_source : 068dca3eae20906b495571f1d80548dc5f99ed51

make fast path in Get/SetItemInt() utility functions safe for sizeof(index type) >= sizeof(Py_ssize_t)

add value range check for C level assignments to bytearray indices in order to mimic the safe Python behaviour

--HG--
rename : tests/run/ass2global.pyx => tests/run/ass2global.py

--HG--
rename : tests/run/str_ascii_auto_encoding.pyx => tests/run/bytearray_ascii_auto_encoding.pyx
rename : tests/run/str_default_auto_encoding.pyx => tests/run/bytearray_default_auto_encoding.pyx

No error checking for PyFloat_AS_DOUBLE() as documented

--HG--
extra : transplant_source : %D5%D9Izb%7F%E6%AF%91%9A2j%25%FC%27%85%7CFs5

--HG--
extra : amend_source : b6140bfd07fdf9ae0c7dde2037b3cbff682260e7

--HG--
rename : tests/run/bytesmethods.pyx => tests/run/bytearraymethods.pyx