Working (with exchange) GGA potential routine. Now for beta part and test with PBEc (has a-b cross terms).
Working (with exchange) GGA potential routine. Now for beta part
and test with PBEc (has a-b cross terms).

dftlibs/xcfun,bast/xcfun,bast/xcfun,dftlibs/xcfun,dftlibs/xcfun,robertodr/xcfun,bast/xcfun,robertodr/xcfun,bast/xcfun,robertodr/xcfun,robertodr/xcfun,dftlibs/xcfun