add: log levels to amqp2engines config and allow extra parameters (as string)
fix: mistype in build-install.sh and typo in cgrid.js
improve: engine acknowledgement log connector and source of acknowledged event and store ack and downtime events to MongoDB
add: engine downtime
improve: exclude components/resources which are in downtime from widget list
Merge branch 'engine-acknowledgement' into engine-downtime
do not modify perfdata from engine acknowledgement (will be done in UI)
Merge branch 'engine-downtime' into develop