Disentangle ropp_io from ropp_fm

[Ian Culverwell]

ROPP8.0 beta reviewer Ben Ruston (NRL) suggests:

I only use the ropp_fm, to build this library I need to build the 
ropp_utils, which is understandable; but also there is a 
requirement to build the ropp_io. It would be nice to disentangle 
this from the ropp_fm. In our implementation, we do this manually 
by only including the necessary pieces of ropp_io in the makefile 
thus making it independent of a bufr, netcdf or hdf5 library.

I suspect we won't do this. We generally consider ropp_io to be an integral part of ROPP. ropp_fm can function perfectly well without bufr or hdf5, and must be very cut down to avoid reference to netcdf.

[Ian Culverwell]

Dave Offiler adds:

Can we ship all 'tools' and just build the lib?