0.5.1

Added

• Added HandsetStats to FlowMachine.
• Added new ContactReferenceLocationStats query class to FlowMachine.
• A new zmq message get_available_dates was added to the flowmachine server, along with the /available_dates
  endpoint in flowapi and the function get_available_dates() in flowclient. These allow to determine the dates
  that are available in the database for the supported event types.

Changed

• FlowMachine's debugging logs are now from a single logger (flowmachine.debug) and include the submodule in the submodule field instead of using it as the logger name
• FlowMachine's query run logger now uses the logger name flowmachine.query_run_log
• FlowAPI's access, run and debug loggers are now named flowapi.access, flowapi.query and flowapi.debug
• FlowAPI's access and run loggers, and FlowMachine's query run logger now log to stdout instead of stderr
• Passwords for Redis and FlowDB must now be explicitly provided to flowmachine via argument to connect, env var, or secret

Removed

• FlowMachine and FlowAPI no longer support logging to a file