Update postprocessing pipeline

[adehecq]

This PR updates many of the postprocessing steps to make it easier to identify errors in submissions and automatically generate a report of the main figures:

• update file naming convention to the latest v2 requirements
• allow team tags of 3-6 characters
• filenaming check is done consistently across all postprocessing steps and the function parse_filename now raises FilenameParseError, which provide a clearer error.
• check for duplicated files (from multiple archives) > the function scan_submissions include a duplicate checking.
• add renaming step for files not following the convention > A renaming step is added to the config (work with regex), it's used when the symlinks are generated.
• Add a CLI step "generate_pdf" which generates a pdf report by concatenating all png figures.
• add a pipeline step to check received submissions against planned submissions
• add verbose option to CLI subcommand run
• add gdown dependency

TODO:

• add Sankey diagram generation : integrate preliminary script into pipeline, using downloaded planned experiment file