mlheading and mliheading: Added C_director_core, which holds the state needed
by the director to disown.
std_string and std_vector: Added specific support for the common case of
a zero-terminated char **.
typemaps.i: Withdraw default argout for SWIGTYPE &
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@4481 626c5289-ae23-0410-ae9c-e8d60b6d4f22