This variable is .true. when xq is gamma and only the gamma point is used
for k point sampling.
The symmetrization used in phcg.x has been imported in ph.x in the case
lgamma_gamma=.true..
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@3288 c92efa57-630b-4861-b058-cf58834340f0
dalcorso