some progress with new pmvn function

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/lava/pkg/mets@974 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
..

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/lava/pkg/mets@975 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Blastingly fast vectorized pmvn

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/lava/pkg/mets@976 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Merge branch 'master' of github.com:kkholst/mets