(Uses decorators and with statement.)

reduce code size of parser and speed it up a little by statically switching to unicode in more places

--HG--
rename : tests/run/pyfuncion_redefine_T489.pyx => tests/run/pyfunction_redefine_T489.pyx

Made tests less verbose by not using distutils.core.setup + skip debugger tests when gdb < 7.2 or not available