maint: Replace unnecessary tabs with spaces. * doc/interpreter/images.awk, libinterp/dldfcn/config-module.awk, libinterp/octave-value/module.mk, m4/module.mk, scripts/java/org/octave/Matrix.java, scripts/miscellaneous/module.mk, scripts/sparse/module.mk, scripts/startup/main-rcfile, test/build-sparse-tests.sh, test/ctor-vs-method/@parent/parent.m: maint: Replace unnecessary tabs with spaces.

function rot = parent (a)
  __trace__ ('begin parent/parent');
  if (nargin == 0)
    rot = class (struct (), 'parent');
  else
    switch class (a)
      case 'parent'
        %% copy constructor
        rot = a;
      otherwise
        error ('type mismatch in parent constructor')
    end
  end
  __trace__ ('end parent/parent');
end