Change tabs to spaces as per YAML spec
Add support for userdata.tsv as output format.

See https://clics.ecs.baylor.edu/index.php/Contest_Control_System#userdata.tsv
for the specification.
Fix format check for tsv files.
Add support for import of accounts.tsv.

See https://clics.ecs.baylor.edu/index.php/Contest_Control_System#accounts.tsv
for the specification.
Add support for results.tsv export.

See https://clics.ecs.baylor.edu/index.php/Contest_Control_System#results.tsv
for the specification.