Use '!' not operator rather than '~' in core m-files. * scripts/general/interp1.m, scripts/image/rgb2ind.m, scripts/plot/findobj.m, scripts/polynomial/polyfit.m, test/build-sparse-tests.sh, test/classes/@Snork/end.m, test/classes/@Snork/mpower.m, test/classes/@Snork/ne.m, test/classes/@Snork/power.m, test/classes/@Snork/subsasgn.m, test/classes/@Snork/subsref.m, test/classes/@Spork/loadobj.m, test/classes/classes.tst: Use '!' not operator rather than '~' in core m-files.

function out = loadobj (in)

  out = in;
  if (!isa (in, 'Spork'))
    out.cack = [];
  end

end