fixed unicode escape handling in byte strings
unescape \xXY in string literals as C allows it to conflict with trailing hex numbers - output string escaping will do the right thing

fix format string in __Pyx_AddTraceback() to let it match input types (line number is not defined as unsigned)

quick way to enable multiple compilation *without* reusing contexts (still about 10x faster than separate startup)

add a warning for unraisable exceptions (but do not show it by default, as this is often irrelevant)

Starting Cython from Windows PowerShell? with

cython.py <arguments>

yields a new console window with Cython output, which closes immedeately after Cython finished. To get Cython's output one would always have to write something like

python C:\Python25\Scripts\cython.py <arguments>

Therefore, i wrote a simple batch file that does fairly the same as cython.py and allows you to start cython simply via

cython <arguments>

I don't know how long_literal used to work, must have ran tests before
that refactor...