db: add a get_archived_ladder method
db: add a get_archived_ladder method

Retrieves the archived ladder from a (specified) previous
season. Optional parameter specifies the ladder we are interested
in.

Signed-off-by: Ilija Hadzic <47a09d4a4430975766160361f65fc72633be50b6@gmail.com>

ihadzic/jim,ihadzic/jim,ihadzic/jim