- Warnings about a mismatch in the Python API during extension import

now use the Python warning framework (which makes it possible to

write filters for these warnings).

- Two new APIs PyOS_snprintf() and PyOS_vsnprintf() were added

which provide a cross-platform implementations for the

relatively new snprintf()/vsnprintf() C lib APIs. In contrast to

the standard sprintf() and vsprintf() C lib APIs, these versions

apply bounds checking on the used buffer which enhances protection

against buffer overruns.