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These examples illustrate how to use pw.x and ph.x to calculate
phonon frequencies at Gamma and K for graphite using
DFT+D2 (Grimme), vdW-DF, vdW-DF2 and rVV10
The number of k points and cutoff are set to very small
values in order to have a fast testing case to compare with.
Much denser k-point grids and higher cutoff values are needed
in order to obtain converged results.
As for the xc functional that should be used in combination with
vdW xc functionals (set to pbe in the example in order not to
upload too many pseudopotentials) it actually is as follows:
rw86 for rVV10, rw86 for vdw-df2, revpbe for vdw-df
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