Doc updates for 3.2

[John W. Eaton]

On 28-Jul-2008, David Bateman wrote:

| Other documentation updates that will be needed before a 3.2 release
| seem to be to be
| 
| * Document the graphics changes made by Shai/Michael as needed.
| * Document the object oriented stuff in a new chapter.
| * Document the use of private directories.
| * Document other functions that were ported from octave-forge (eg
| imread, dlmwrite, etc)
| * NEWS file.
| * Other things ?
| 
| Maybe these should be added to your 3.1 status report John?

I'll include these in the next report.

Thanks,

jwe