Minor changes...

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmetrics@5939 5d4a7380-5c0c-0410-b446-d4a5018c0119
Selectively importing functions from "sn". Reason is that "sn" exports a function called "vech"; as fBasics does...

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rmetrics@5940 5d4a7380-5c0c-0410-b446-d4a5018c0119