Rename assign_paper to assign_review.
Log: Default to 50 entries, show entries with no user.
Add pc_members_selector_options and use it.

Consistent handling of sortByLastName.
Internal: Add Contact::assign_paper_pc and use it.

Consistent saving of lead/shepherd.
Upload assignment: 'type' is a synonym for 'action'.
Search: Assign > Lead/Shepherd.

And some nits.