Correct factor 2 on tau in BR correlation.
Correct factor 2 on tau in BR correlation.

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