cif2qe script modified to produce an input compatible with crystal_sg 
coordinates (Contributed by Federico Zadra).
Small change to the documentation and introduced a check that when
space_group /= 0 crystal_sg coordinates are given in input.


git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11209 c92efa57-630b-4861-b058-cf58834340f0