Issue of deprecated warnings in 3.0.1b and 3.1.x

[David Bateman]

The warnings like

    warning ("Octave:deprecated-function",
        ["is_list is obsolete and will be removed from a future\n",
               "version of Octave, please use islist instead"]);

should instead be written as

    warning ("Octave:deprecated-function",
        strcat("is_list is obsolete and will be removed from a future\n",
               "version of Octave, please use islist instead"));

otherwise the warning is incorrectly printed. Do you want a patch?

D.