chang valueError from code 200 to 400
add InvalidKey error (used by filtering)

add filter function and implementation for location and timeseries
improvement of locations API -  fields included and order of fields
Add support of choice fields with display name rendering
Add API for alarmSettings
Write API for logicalgroups (without support of setting parents)
Write API for alarms, including write support for nested alarm_items
Save parent relations with LogicalGroup save
change of DataOwner API
modifications for saving owner for logicalgroups
Add Aquo tables to API
improved timeseries API - also for writing
merge