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/pkg/private/install.m
+++ b/scripts/pkg/private/install.m
@@ -121,11 +121,10 @@
         endif
 
         ## Set default installation directory.
-        desc.dir = fullfile (prefix, cstrcat (desc.name, "-", desc.version));
+        desc.dir = fullfile (prefix, [desc.name "-" desc.version]);
 
         ## Set default architectire dependent installation directory.
-        desc.archprefix = fullfile (archprefix, cstrcat (desc.name, "-",
-                                                         desc.version));
+        desc.archprefix = fullfile (archprefix, [desc.name "-" desc.version]);
 
         ## Save desc.
         descriptions{end+1} = desc;
@@ -172,9 +171,8 @@
         ok = false;
         for i = 1:length (bad_deps)
           dep = bad_deps{i};
-          error_text = cstrcat (error_text, " ", desc.name, " needs ",
-                               dep.package, " ", dep.operator, " ",
-                               dep.version, "\n");
+          error_text = [error_text " " desc.name " needs " ...
+                        dep.package " " dep.operator " " dep.version "\n"]);
         endfor
       endif
     endfor