Generalize sql_uri function to get any setting.
Generalize sql_uri function to get any setting.

* wqflask/wqflask/database.py (sql_uri): Generalize to get_setting.
(database_connection): Call get_setting instead of sql_uri.

genenetwork/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2