Added boost fusion test.

[[Imported from SVN: r6696]]

cmake/modules/FindBoostFusion.cmake

+include(DuneBoost)
+
+message(STATUS "Checking whether the Boost::FUSION library is available")
+check_cxx_source_compiles("
+\#include <boost/fusion/container.hpp>
+int main(){
+  boost::fusion::vector<int,char,double> v;
+  return 0;
+}" HAVE_BOOST_FUSION )
+if(HAVE_BOOST_FUSION)
+message(STATUS "Boost::FUSION is available")
+endif(HAVE_BOOST_FUSION)