(ThubanApplication.run_db_param_dialog): New. Suitable as a
db_connection_callback. Main difference is that the dialog run
from this method doesn't have a parent so it can be used even when
there is no main window
(ThubanApplication.OpenSession): Use self.run_db_param_dialog if
no db_connection_callback was given. This way the dialog pops up
even when the .thuban file was given as a command line parameter.
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