routines are due to the fact that dvan becomes spin dependent and has an additional index. git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@839 c92efa57-630b-4861-b058-cf58834340f0
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@828 c92efa57-630b-4861-b058-cf58834340f0