Track message queue lengths of all registered pids
Track message queue lengths of all registered pids

Simple update that reports the message queue lengths of every registered
process.

BugzId: 13797

Conflicts:
	src/chttpd_misc.erl

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb