Reworked data generation for pbs_publication_fairshare

Created by: zlamalp

• Use single call to retrieve all author publications at once instead of getting it by ID. At real environment, this lowers number of API calls from cca 4000 to 1000 per facility with this service.

• Because of rounding error while adding coefficient of publications this may change resulting weight for users/group. Shortly put: Order in which we iterate over users publications matters to perl!