Fix submission on last day of grace period and close cohort 6 #1178
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Fixes #1172
Undo the hot fixes we did to quickly unblock submission on the last day of the grace period (#1163, #1164, #1165) and the underlying bugs:
days_remaining_before_submission
should be inclusive of the last day of the grace periodsubmitting_cohort
was a number so we couldn't getcohort_start_date
from it, we neededsubmitting_cohort_start_date
This will have the effect of closing out cohort 6 so will only merge after our extended deadline (Sunday 19th Jan).
Also removes the "0 days remaining" for cohort 6 on the homepage.
Finally as a side effect also fixes #1176