DATABASE should be upgraded



perf: distribute RRDs correspodening to the perf handler
core: sched_timeout refined
core: service_retain
core: lib/mysql service_retain
php: service_retain
ui: overview supports remote bartlby's
ui: server/service detail supports remote bartlby's
ui: services list supports remote bartlby
ui: service_retain
ui: add perf defaults to package
ui: catch un-existing objects, server|service|worker
ui: exit if either built in nor shared bartlby extension was found (discovered during php upgrade )
ui: addons got own config file (ui-extra.conf)
php: E_WARNING on unexisting config file