Adding +/- operators for iterators
Compatibility fix: no UTF-32 codec in Python 2.4/2.5.
fix exception message
fix test
compare test result with CPython

--HG--
rename : tests/run/ref2global.pyx => tests/run/ref2global.py
Merge pull request #192 from alexis-mignon/master

Adding +/- operators for c++ vector iterators
speed up access to module globals
factor out builtin access code
fix name lookup in class scope
Pass-through single surrogates in Py_UNICODE[] literal encoding routine.
Merge pull request #193 from nnemkin/pyunicode_string_fix

Compatibility fix for Py_UNICODE* support.