Adds an hb_deep_log() function for multiple levels of debugging verbosity. Level...

Adds an hb_deep_log() function for multiple levels of debugging verbosity. Level 1 displays when hb_log does (job->verbose == 1)  and is now meant for logging that helps in tech support. Level 2 adds memory-related logging like freed buffers, and level 3 is for granular stuff that displays once per sample, frame, packet, etc. The debug level continues to be set when hb_init() is called.

git-svn-id: svn://localhost/HandBrake/trunk@1819 b64f7644-9d1e-0410-96f1-a4d463321fa5