Re: goals for 3.1

[David Bateman]

John W. Eaton wrote:

>   * Graphics:
>       -- specific types for properties with improved property value checking

        -- Add the addprops function allow additional properties to objects
        -- Add the hggroup object that has no fixed properties for use
of barseries, etc
        -- Add callback DeleteFcn/CreateFcn to objects
        -- Allow listener functions to be added to objects

   * Merge the if/else mess in sort, and other functions into the
octave_value or liboctave classes.

   * tree-walker evaluator class, that is then used for profiler,
debugger as well, and maybe as the basis for an in-built m-file to
oct-file compiler.

D.