Added support for Perl style \N \P and \p.

Completed first draft of Unicode UCS-4 support.
Broken compiler compatibility fixes.
Added unicode_iterators.


[SVN r26185]

test/regress/main.cpp

@@ -53,6 +53,7 @@ int cpp_main(int /*argc*/, char * /*argv*/[])
    test_emacs();
    test_operators();
    test_overloads();
+   test_unicode();
    return error_count;
 }