added archos 50 helium plus https://sourceforge.net/p/libmtp/feature-requests/221/
added archos 50 helium plus
https://sourceforge.net/p/libmtp/feature-requests/221/

libmtp/libmtp,philipl/libmtp,libmtp/libmtp,libmtp/libmtp,philipl/libmtp,philipl/libmtp