re-remove recursive descent parser; will rely on leg parser even though source tracking can't be done
removed source tracking as the parser can't support it
fixed problems reported by go vet
changed Expression from a struct to an interface
removed reference to Source in generated Go
prepend to schemas, etc; not append
don't generate more than is needed when replicating tables
remove font handling from generated dot files
added graph view to monitor
fixed incorrect loading and validation of @address fields
replication: handle <= operations