How important is it to preserve the operation of Csound without
LibSndFile?  I am finding it increasingly confusing to have both
versions in the same sources, especially as using the library clears
away so much code.  As far as I can tell this library runs on all
platforms, and we can link it statically to provide stand-alone
binaries.

btw I am not sure how to do dithering at present with the library.
There are signs that dithering is intended in the code, but is not
available, and Erik suggests that we not wait.

==John ffitch