fixed build warnings
Enabled more build warnings
Text cleanups

chunk_ctl renamed chunk_meta
queue.cpp declarations moved to ioremap::grape namespace
chunk stat counters name cleanup
and other
Streamlined chunk logging, chunk_meta's lowered to DEBUG
New queue methods: clear (clears queue) and stats-clear (clears statistics)

Also queue state has been separated from counters and statistics
Removed unnecessary queue state writes (peek doesn't change state)
README: resolved some TODO links with stubs on reverbrain wiki