Make sure all tools wait for keypress on exit when in DOS 2.x

[tschak909]

Care needs to be taken to make sure, especially for the query tools (FLD, FLH, FCONFIG), that a message similar to

PRESS [RETURN] TO CONTINUE

Is displayed if not running in a CLI dos. You can see examples of this in various tools, e.g.:
https://github.com/FujiNetWIFI/fujinet-config-tools/blob/master/flh/src/main.c#L90

Care should be taken to display this when an SIO query fails, so that the error message can be seen.

[jellonek]

The fix for that was already merged in #21 so IMO this one should be closed.