Adjusted BB vignette text regarding a dfsane() failure.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/optimizer@878 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Reverted back to solve.QP from quadprog. Fixed NAMESPACE to import optim from stats. Bumped version number.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/optimizer@879 edb9625f-4e0d-4859-8d74-9fd3b1da38cb