add a primary key to the once_a_bins table
add a timestamps table to record the latest runs
a base class for all boards
make CPANio::Board::OnceA a subclass of CPANio::Board
add support for incremental updates of the empty bins
code for bulk/incremental updates of the author bins
rename the once_a_bins table to release_bins
do not force the update of BackPAN::Index
put the bins management on its own
the update method will compute all the bins
a script to update all boards at once

starting with the bins
compute the once-a current contests results using the release_bins table