bugfix.
Full Vxc is included.

Thus results is irrelevant for XCFUN (we need to use same initial
condition. And FRZWF=T). use emax_sigma 9999 in GWinput
(or use
  do itpp= 1,nz
  do itp= 1,nz
 for do block adding v_xc in hqpe.sc.m.F)


Vxc^LDA is completely inluded.
Then we see no difference (0.001 eV level;after 10 iteration) in band gap.

But if
c aug2003
          do itp = 1,ntqxx
          do itpp= 1,ntqxx
          print *,' xc test xxxxxxxxxx 2013aug gap'
c          do itp = 1,nz
c          do itpp= 1,nz
instead of nz, in hqpe.sc.m.F (energy cutoff for Vxc expansion), we
have difference.

That is,

rm sigm mixsigma
cp SEBK/* .
echo 0|~/ecalj/fpgw/exec/hqpe_sc
(see sigm.gas --> sigm in softlink).

takao@TT4:~/ecalj/TestInstall/TESTGGG2/ggg203$ ~/ecalj/lm7K/lmf gas |tee llmfx2|grep gap
 VBmax = 0.031700  CBmin = 0.089491  gap = 0.057791 Ry = 0.78595 eV
 VBmax = 0.031707  CBmin = 0.089499  gap = 0.057792 Ry = 0.78598 eV


takao@TT4:~/ecalj/TestInstall/TESTGGG2/ggg201$ ~/ecalj/lm7K/lmf gas |tee llmfx2|grep gap
 VBmax = 0.031263  CBmin = 0.092564  gap = 0.061301 Ry = 0.83369 eV
 VBmax = 0.031265  CBmin = 0.092566  gap = 0.061301 Ry = 0.83369 eV