A very nice new feature "discharging" is added. Now a rather small num_basis_tot can be used. 
I believe that with slight increase of calculation cost, the new feather can dramatically 
decrease the memory requirement.



git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11048 c92efa57-630b-4861-b058-cf58834340f0