When separating coa requests, talloc_steal them, too
Added copy packet functionality

Mainly for CoA.  May be useful elsewhere
fake->packet has parent fake, not request
radius_verify() to recursively check talloc relationships
Remove pointless debug message
Enable -D, and document it in -h
Set parent of VP properly.
radius_copy_packet for coa->packet instead of memcpy.

Avoids talloc errors
Better checks for cleaning up requests on exit
Handle more corner cases with CoA cleanups
Doxygen