Clean up update users from SMIS

When we update users from SMIS into ICAT, we use 2 web services findSessionsInfoLightForProposalPk and findUsersByExpSession. After discussion with Stefan, we should only use findSessionsInfoLightForProposalPk, as this web service returns LC, MP, CP, U (local contacts, main proposer, coproposers, users in AForm) lists for all proposal types. findUsersByExpSession can only be used for non-inhouse/commissioning proposal. findParticipantsForProposal returns all users for all session of the proposal (i.e. many people for BAGs).

• To discuss: Admins can remove (hide) certain scientists from the CP or the U (e.g. if the scientist left the company). This hidden parameter is not returned by the web services, but it could be interesting for ICAT.