Change in default behaviour wrapping C++ bool for Python.

Only a Python True or False will now work for C++ bool parameters.
This fixes overloading bool with other types.

Examples/test-suite/python/overload_bool_runme.py

@@ -0,0 +1,55 @@
+import overload_bool
+
+# Overloading bool, int, string
+if overload_bool.overloaded(True) != "bool":
+  raise RuntimeError("wrong!")
+if overload_bool.overloaded(False) != "bool":
+  raise RuntimeError("wrong!")
+
+if overload_bool.overloaded(0) != "int":
+  raise RuntimeError("wrong!")
+if overload_bool.overloaded(1) != "int":
+  raise RuntimeError("wrong!")
+if overload_bool.overloaded(2) != "int":
+  raise RuntimeError("wrong!")
+
+if overload_bool.overloaded("1234") != "string":
+  raise RuntimeError("wrong!")
+
+# Test bool masquerading as int
+if overload_bool.intfunction(True) != "int":
+  raise RuntimeError("wrong!")
+if overload_bool.intfunction(False) != "int":
+  raise RuntimeError("wrong!")
+
+# Test int masquerading as bool
+# Not possible
+
+
+#############################################
+
+# Overloading bool, int, string
+if overload_bool.overloaded_ref(True) != "bool":
+  raise RuntimeError("wrong!")
+if overload_bool.overloaded_ref(False) != "bool":
+  raise RuntimeError("wrong!")
+
+if overload_bool.overloaded_ref(0) != "int":
+  raise RuntimeError("wrong!")
+if overload_bool.overloaded_ref(1) != "int":
+  raise RuntimeError("wrong!")
+if overload_bool.overloaded_ref(2) != "int":
+  raise RuntimeError("wrong!")
+
+if overload_bool.overloaded_ref("1234") != "string":
+  raise RuntimeError("wrong!")
+
+# Test bool masquerading as int
+if overload_bool.intfunction_ref(True) != "int":
+  raise RuntimeError("wrong!")
+if overload_bool.intfunction_ref(False) != "int":
+  raise RuntimeError("wrong!")
+
+# Test int masquerading as bool
+# Not possible
+