Possibility to import databases

It would be useful to have an easy, unified method to import custom databases for locations. The user would have to define the fields in his table and prepare a syntactically correct table himself. The system should check it for basic to avoid errors (fields are of the appropriate type, and number), and then incorporate it into the database with a prefix, like location_.

From the input field one could select to use imported database for the fallback base of autocompletion. Since imported database is expected to be large, first the autocompletion should parse the location table, only then the selected imported databases.