adress issue #196: User can turn off interactive mode of get_tsn and get_uid.
ask also supported by downstream functions
get_uid / get_tsn should return NA, when not found! partial revert of commit cdc01ae, since this brakes downstream functions (eg tax_name!).
test new ask-argument
add tests for new ask-argument,
fixed ubio-test,
turned (were possible) verbose off in tests!