fix command line argument parsing behavior, allow 'scan' of stdin and file input
fix command line argument parsing behavior, allow 'scan' of stdin and file input

Signed-off-by: Michael Krufky <a91dcbb4df49d8bfe0a9930d7ff911a4292ca1f5@valley.nyc.rr.com>

mkrufky/libdvbtee,pashamesh/libdvbtee,anshul1912/libdvbtee,anshul1912/libdvbtee,mkrufky/libdvbtee,mkrufky/libdvbtee,anshul1912/libdvbtee,pashamesh/libdvbtee,mkrufky/libdvbtee,mkrufky/libdvbtee,pashamesh/libdvbtee