fix directorout typemap for const std::string&. Adding warning about the new typemap, which is not thread safe

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@6872 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/python/director_string_runme.py

@@ -0,0 +1,12 @@
+from director_string import *
+
+class B(A):
+  def __init__(self,string):
+    A.__init__(self,string)
+
+
+
+b = B("hello")
+
+b.get(0)
+b.get_first()