* Updated Database->resync_databases() to never run on non-striker machines. On Strikers, before a resync, _age_out_data() is called to clear old data in long-off databases.
* Created System->check_memory() that is loosely based on anvil-check-memory, but checks to see if it's being controlled by a systemctl started daemon and, if so, reads the RAM in use from it's status output.
Signed-off-by: Digimer <digimer@alteeve.ca>