#2 Save mp3 file on i/o error at download

[Richard van den Berg]

One of the great features of this package is the
abbility to download files from the Jazpiper. You can't
do this with the supploed windows software. One of my
SmartMedia cards kept giving me an i/o error near the
end of an mp3 file. I made this patch so openjaz still
saves the file upon error.

Perhaps this should be an optional feature though.

[Richard van den Berg]

save on io error diff