Added active-set for lsqnonneg() function.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/optimist@348 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added active-set for lsqnonneg() function.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/optimist@349 edb9625f-4e0d-4859-8d74-9fd3b1da38cb