1. Added code to the memory leak detecting code to give the user the
possibility to add information, thereby forming a traceback.
2. Make the memory leak detecting code multithread-safe.
The idea is that we're actually dealing with two separate critical
sections, one containing the hash tables with the information, the
other containing the current memory checking mode. Those should not
be handled with the same lock, especially since their handling overlap.
Hence, the added second lock.
thread-safe (where thread-safe counterparts are not available on all
platforms), and don't memcpy to NULL-pointers
Submitted by: Anonymous
Reviewed by: Bodo Moeller
Also, clean up htons vs. ntohs confusions.
