voteview: when looking up the IDs of presidents use the icpsr_prez field because these IDs are not the same as the IDs for Members of Congress when they are in Congress
voteview: don't try to put votes into sessions because the dates on votes here and my session dates in sessions.tsv are not very reliable

Just put everything into a session "X" for comformity for how we create IDs for and paths for contemporary roll call votes.
utils: before updating congress-legislators from the network, check if the environment variable UPDATE_CONGRESS_LEGISLATORS is not set to NO
utils: code cleanup in get_person_id