Force encoding back to 'BINARY'

In normal use, data received by the UDP input has the encoding set to
'UTF-8'. This occasionally throws the BinData parsers off so set the
encoding back to 'BINARY' before parsing.

Keep some commented-out BinData tracing present which is very useful for
working out what is going wrong, however I can't see a nice way to
enable/disable it in code so #'s it is for now.