Replace function handles with function names in cellfun calls for 15% speedup. * accumarray.m arrayfun.m, blkdiag.m, cell2mat.m, common_size.m, interp3.m, interpn.m, __isequal__.m, structfun.m, voronoi.m, strread.m, fullfile.m, getfield.m, __xzip__.m, setfield.m, what.m, pkg.m, axis.m, pareto.m, __ghostscript__.m, __go_draw_axes__.m, __patch__.m, refreshdata.m, whitebg.m, lcm.m, index.m, strcat.m, strmatch.m, validatestring.m: Replace function handles in calls to cellfun with double quoted function names.

--- a/scripts/plot/refreshdata.m
+++ b/scripts/plot/refreshdata.m
@@ -83,7 +83,7 @@
     obj = get (h (i));
     fldnames = fieldnames (obj);
     m = regexpi (fieldnames(obj), '^.+datasource$', "match");
-    idx = cellfun (@(x) !isempty(x), m);
+    idx = ! cellfun ("isempty", m);
     if (any (idx))
       tmp = m(idx);
       props = [props; {vertcat(tmp{:})}];