[fix] Remove reference to parltrack_votes_data
[enh] Start the work to remove VoteData (still broken)
[enh] import script Import to Proposal, ProposalPart and Vote
[mod] Remove now useless VotesData model
[mod] Refactor json retrieving in a function
[mod] Move json parsing in a generator
[mod] Use enumerate
[enh] if given a file to import_ep_votes_data, use it instead of downloading from parltrack
[enh] Add comments and help
[enh] Sql optimization is fun (x3 speed up)
[enh] Fix Link mep command to set the mep on a proposal part