Check __repr__ and __str__ functions for buffer overflows

[eheien]

The SWIG wrappers for some of the QuakeLib classes include str and repr functions to allow additional Python functionality. These functions may not be safe in terms of buffer overflow - if formatting is set in a particular way it may be possible for a user to overwrite the 1024 character buffer and cause memory problems. Checks should be put in place to avoid this, or the code rewritten to guarantee there is no possibility of overflow.