Overhaul image, imagesc to use newplot and support low-level invocation form. * scripts/image/image.m: New variable do_new indicates high-level calling form. For high-level invocation, call newplot before __img__. Correct linearity check if vectors are reversed (high-to-low values). Only apply image properties to axes if doing a high-level invocation. * scripts/image/imagesc.m: New variable do_new indicates high-level calling form. Delete subfunction __imagesc__ and incorporate minimal amount of code into imagesc. Only apply climits for high-level invocation.

## -*- texinfo -*-
## @deftypefn  {Function File} {} FIRfilter ()
## @deftypefnx {Function File} {} FIRfilter (@var{p})
## Create a FIR filter with polynomial @var{p} as coefficient vector.
## @end deftypefn

function f = FIRfilter (p)

  f.polynomial = [];
  if (nargin == 0)
    p = @polynomial ([1]);
  elseif (nargin == 1)
    if (!isa (p, "polynomial"))
      error ("FIRfilter: expecting polynomial as input argument");
    endif
  else
    print_usage ();
  endif
  f = class (f, "FIRfilter", p);
endfunction