Changeset 409 for cafu/trunk

Applied some fixes and changes for building and linking under Ubuntu 11.10 (Oneiric Ocelot), using GCC 4.6.1.

Some but not all of the changes have related links:

•  http://trac.wxwidgets.org/ticket/13375 linking to  http://trac.wxwidgets.org/changeset/69186
•  http://code.google.com/p/bullet/issues/detail?id=481