Log Message:
Updated swig to 1.3.31:

    SWIG-1.3.31 summary:
	- Python modern classes regression fix

    SWIG-1.3.30 summary:
	- Python-2.5 support
	- New language module: R
	- Director support added for C#
	- Numerous director fixes and improvements
	- Improved mingw/msys support
	- Better constants support in Guile and chicken modules
	- Support for generating PHP5 class wrappers
	- Important Java premature garbage collection fix
	- Minor improvements/fixes in cffi, php, allegrocl,
		perl, chicken, lua, ruby, ocaml, python, java, c# and guile
	- Many many other bug fixes