Automatically download project data

[jspijker]

For predefined projects / municipalities, update the data once a day. Related to #359.

• The list of predefined projects/municipalities is stored in the meta table
• Projects are added by a function
• The list is read from environment vars or from predefined file (production vs development environment)
• the list should contain type, name of proj/mun, and start data as days before now()
• The time to queue the downloads is either 04:00 (hard coded) or read from environment var
• The queue_manager checks the time and once a day loads the necessary requests (how do we track if this is happened?)
• Removal of old / obsolete time ranges is done during database janitoring (not implemented soon)

[jspijker]

Had the new functionality running for a couple of days and works as expected.