Better description of allowed values for atom labels in input documentation


git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11124 c92efa57-630b-4861-b058-cf58834340f0
Small cleanup and uncorrect call to errore.


git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11125 c92efa57-630b-4861-b058-cf58834340f0