correct saving of starting_kpoints

Pietro Delugasrequested to merge
pietrodelugas/q-e:fix_xkstarting into develop

when k_points is not initialized in input starting_kpoints must be initialized checking the number of starting k points and the value of nk1 nk2 and nk3.

still to check everything is ok before merging

Edited by Pietro Delugas

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