Use matrix concatenation for strings, rather than cstrcat(), for clarity and performance. matrix concatenation is ~80% faster than cstrcat(). * doc/interpreter/strings.txi: Document preference for matrix concatenation as opposed to alternatives. * doc/interpreter/geometryimages.m, doc/interpreter/interpimages.m, doc/interpreter/plotimages.m, doc/interpreter/sparseimages.m, doc/interpreter/splineimages.m, scripts/general/genvarname.m, scripts/general/int2str.m, scripts/general/num2str.m, scripts/help/__makeinfo__.m, scripts/help/help.m, scripts/miscellaneous/copyfile.m, scripts/miscellaneous/dir.m, scripts/miscellaneous/edit.m, scripts/miscellaneous/fact.m, scripts/miscellaneous/fullfile.m, scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/movefile.m, scripts/miscellaneous/perl.m, scripts/miscellaneous/python.m, scripts/miscellaneous/run.m, scripts/miscellaneous/tempdir.m, scripts/miscellaneous/unpack.m, scripts/pkg/private/configure_make.m, scripts/pkg/private/create_pkgadddel.m, scripts/pkg/private/extract_pkg.m, scripts/pkg/private/get_description.m, scripts/pkg/private/get_forge_pkg.m, scripts/pkg/private/getarch.m, scripts/pkg/private/getarchprefix.m, scripts/pkg/private/install.m, scripts/pkg/private/installed_packages.m, scripts/pkg/private/load_packages_and_dependencies.m, scripts/pkg/private/rebuild.m, scripts/pkg/private/repackage.m, scripts/pkg/private/shell.m, scripts/pkg/private/uninstall.m, scripts/plot/private/__go_draw_axes__.m, scripts/signal/spectral_adf.m, scripts/signal/spectral_xdf.m, scripts/statistics/tests/z_test.m, scripts/statistics/tests/z_test_2.m, scripts/strings/mat2str.m, scripts/strings/strtok.m, scripts/testfun/__run_test_suite__.m, scripts/testfun/assert.m, scripts/testfun/demo.m, scripts/testfun/speed.m, scripts/testfun/test.m, test/eval-catch.tst, test/io.tst, test/try.tst: Replace cstrcat() with matrix concatenation where possible.

--- a/scripts/testfun/test.m
+++ b/scripts/testfun/test.m
@@ -155,10 +155,10 @@
   ## Locate the file to test.
   __file = file_in_loadpath (__name, "all");
   if (isempty (__file))
-    __file = file_in_loadpath (cstrcat (__name, ".m"), "all");
+    __file = file_in_loadpath ([__name ".m"], "all");
   endif
   if (isempty (__file))
-    __file = file_in_loadpath (cstrcat (__name, ".cc"), "all");
+    __file = file_in_loadpath ([__name ".cc"], "all");
   endif
   if (iscell (__file))
       ## If repeats, return first in path.
@@ -229,7 +229,7 @@
 
   ## Ready to start tests ... if in batch mode, tell us what is happening.
   if (__verbose)
-    disp (cstrcat (__signal_file, __file));
+    disp ([__signal_file, __file]);
   endif
 
   ## Assume all tests will pass.
@@ -281,7 +281,7 @@
           __demo_code = __code;
           __demo_idx = [1, length(__demo_code)+1];
         else
-          __demo_code = cstrcat (__demo_code, __code);
+          __demo_code = [__demo_code, __code];
           __demo_idx = [__demo_idx, length(__demo_code)+1];
         endif
 
@@ -326,9 +326,9 @@
       try
         __vars = deblank (__vars);
         if (! isempty (__vars))
-          eval (cstrcat (strrep (__vars, ",", "=[];"), "=[];"));
+          eval ([strrep(__vars, ",", "=[];"), "=[];"]);
           __shared = __vars;
-          __shared_r = cstrcat ("[ ", __vars, "] = ");
+          __shared_r = ["[ ", __vars, "] = "];
         else
           __shared = " ";
           __shared_r = " ";
@@ -686,7 +686,7 @@
       if (length (ln) >= 2 && strcmp (ln(1:2), "%!"))
         body = [body, "\n"];
         if (length (ln) > 2)
-          body = cstrcat (body, ln(3:end));
+          body = [body, ln(3:end)];
         endif
       endif
     endwhile