Allow embedded nulls in std::string <-> Python string conversions,

patch from greg Landrum <greglandrum@mindspring.com>.

Tests by Dave A.


[SVN r15945]

libs/python

@@ -1 +1 @@
-Subproject commit c389e057b428f36d364f9226cb131aa70b74b159
+Subproject commit 7fc441801d9813d978bee8e2f959f521eb86ed9e