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# Date Author Comment
d03796c2 04/05/2013 06:48 pm Giorgos Korfiatis

Redesign quota holding

A Holding now tracks the current usage (amount imported)
and the amount available to export (stock).

Counters come in pairs (imported_min, imported_max and
stock_min, stock_max respectively) to allow for a two-step
commission.

For example, issuing a commission to import some quantity...
2b888e60 04/05/2013 06:48 pm Giorgos Korfiatis

Merge Policy model into Holding

Since the removal of quantity, Policy was left with only one value:
capacity. To simplify things, we directly include capacity in Holding.

This makes obsolete the following functions, which are removed:
get_limits, set_limits, get_holding, set_holding.