Added __bobo_debug_mode__ special module variable. When set it shows...

Added __bobo_debug_mode__ special module variable. When set it shows tracebacks,and tells you why it can't publish an object (i.e. not found, no doc string, unauthorized--no headers, or bad username/password, or starts with an underscore). Also special variables can be set through the environment BOBO_DEBUG_MODE, BOBO_HIDE_TRACEBACKS, BOBO_REALM. Note: __bobo_debug_mode__ overrides __bobo_hide_tracebacks__ which is now deprecated.