Add possibility to get back the raw data stream after trying to decode a file.
Calling get_rawdata() after get_event() will give you the raw data stream of
tham attempt to decode an event.
Can be useful to filter out failed decodings, just catch the get_event() return
and then write get_rawdata()'s stream to a file again.
Write out all failed decodings as raw events. Only teste for RAL setup for now.