Wrong shortage computation

On the first loop, get_shortage adds a second times the delta of moves at current date.

assigned to @ced

added stock type::behavior + 1 deleted label

New changeset f7020662a64c by C?dric Krier in branch 'default':
Wrong computation of delta to find shortages
http://hg.tryton.org/modules/stock_supply/rev/f7020662a64c

added 1 deleted label and removed 1 deleted label

closed

New changeset 9e6d4c48af65 by C?dric Krier in branch 'default':
Wrong computation of delta to find shortage
http://hg.tryton.org/modules/stock_supply_production/rev/9e6d4c48af65

New changeset b5f29a71eee3 by C?dric Krier in branch '3.2':
Wrong computation of delta to find shortages
http://hg.tryton.org/modules/stock_supply/rev/b5f29a71eee3

New changeset a3bd3c9065e2 by C?dric Krier in branch '3.0':
Wrong computation of delta to find shortages
http://hg.tryton.org/modules/stock_supply/rev/a3bd3c9065e2

New changeset 7f83548da55f by C?dric Krier in branch '2.8':
Wrong computation of delta to find shortages
http://hg.tryton.org/modules/stock_supply/rev/7f83548da55f

New changeset df5ecc0c0d69 by C?dric Krier in branch '2.6':
Wrong computation of delta to find shortages
http://hg.tryton.org/modules/stock_supply/rev/df5ecc0c0d69

New changeset 75a615a46546 by C?dric Krier in branch '3.2':
Wrong computation of delta to find shortage
http://hg.tryton.org/modules/stock_supply_production/rev/75a615a46546

New changeset 433e4cf66956 by C?dric Krier in branch '3.0':
Wrong computation of delta to find shortage
http://hg.tryton.org/modules/stock_supply_production/rev/433e4cf66956

New changeset 3fb57a930115 by C?dric Krier in branch '2.8':
Wrong computation of delta to find shortage
http://hg.tryton.org/modules/stock_supply_production/rev/3fb57a930115

New changeset 070f62b6e4fc by C?dric Krier in branch '2.6':
Wrong computation of delta to find shortage
http://hg.tryton.org/modules/stock_supply_production/rev/070f62b6e4fc