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

1) External interface for 1d and 2d viewers to allow other fortran programs
   to display 1d and 2d spectra without having to write spectra to disk
   with specific filenames.

   This feature is currently under test and is available to anyone who
   needs it now.

2) Upgrade the version of buffit bundled with Sunsort from 3.0 to 4.5

   This will take some work, but should allow more fitting options.

3) Allow peak fitting on projected spectra.

4) More efficient way of finding out which ADCs fired.

5) More debug/verbosity control.

6) Allow user routines to signal errors.
