These are features which have been requested for later versions of
Sunsort, or are features which are easy to add.

1) More debug/verbosity control.

2) Allow on-the-fly compression and decompression of EbyE files.

3) Tidy up and document sort subroutines. Make sure FORTRAN interfaces
   are up to spec.

4) Add writing support to ANU format data.

5) Make sure that projection from copies of 2d spectra work.
