kangaroo

Copperbox revision 1073.

I've reverted the changes made to ParseMonad in revision 1072, as the ByteString building parsers weren't useful.

Running the MIDI printer points to a persistent problem the intraparse parser - I'm not representing end-of-file in a useful way: the restrict combinator should be able to restrict to the the end-of-file and let the cursor go to the end-of-file (this is fine behaviour - it is only an error if an actually read is attempted at the end-of-file). Currently the restrict parser doesn't allow this and throws a range error if it tries to restrict to the end-of-file.