WIP: Make the Committee Admin a lot faster

Ghost Userrequested to merge
fix/faster-committee-admin into master

Closes no issue

Short description

This MR makes the CommitteeAdmin a lot faster, by doing the following two things:

  1. Use raw_id_fields for the Member selection in the CommitteeMembership inline. This avoids repeating a selection box with all users multiple times. raw_id_fields is a bit uglier, but still usable. Once Django 2.0 is released, we can switch the raw_id_fields to autocomplete_fields.

  2. Add a number of select_relateds in the right places.

Edited by Ghost User

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