Allow JDBC Connection Properties in RA

Currently there is no way to pass arbitrary values to the JDBC driver from the TranQL RA [as in DriverManager.getConnection(String url, Properties info)]. There should be a config-property for "ConnectionProperties" or something that takes a String like "name=value;name=value", parses that into a Properties, and adds "user" and "password" properties based on the UserName and Password RA properties (if they weren't specified in the user's ConnectionProperties).