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Modified sorting routine to use secondary key and used this in several places to simplify sorting of LAPW, stars...

...in vgen_finalize to make Daniel happy.

merge requested due to commit

Outside of vgen/vgen_xcpot.F90 this potential contribution is used such
that it is assumed that every entry of the interstitial part is divided
by the number of G vectors contributing to the respective stars.

This fixes an issue in the hybrid functionals calculation. Also for
GW it is needed in this form.

OMP DEFAULT(SHARED) lead to several variables beeing shared, though they
had to be private. Most importantly fct2