cleanup more unused variables
comment from PR
allow scenarios for benchmarks
better message if scenario doesn't parse; calculated default.
Merge pull request #436 from Incubaid/cleanup

cleanup more unused variables
Merge pull request #438 from Incubaid/bench_scenarios

allow scenarios for benchmarks
update meta and changelog for 1.7.3 release
update camltc to 0.9.2
fix package for moved README
rework nursery to ensure no keys can be lost during migration (WIP)

Conflicts:
	src/client/client_protocol.ml
	src/node/backend.ml
	src/node/local_store.ml
	src/node/store.ml
	src/node/sync_backend.ml
extra checks for SetInterval, DeletePrefix and DeleteRange
update nursery

Conflicts:
	src/node/sync_backend.ml
add AdminTestAndSet update

Conflicts:
	src/node/store.ml
	src/tlog/update.ml
fix accept_fringe for freshly minted clusters