Add cron job to automatically assign shipments

Following: https://discuss.tryton.org/t/automatically-assigning-shipments/2535

assigned to @pokoli

added production stock type::feature + 1 deleted label

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review318011002 updated at https://codereview.tryton.org/318011002/#ps290711002

review318011002 updated at https://codereview.tryton.org/318011002/#ps312061002

review318011002 updated at https://codereview.tryton.org/318011002/#ps345701002

review318011002 updated at https://codereview.tryton.org/318011002/#ps353431002

review318011002 updated at https://codereview.tryton.org/318011002/#ps334121002

review318011002 updated at https://codereview.tryton.org/318011002/#ps342011008

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review318011002 updated at https://codereview.tryton.org/318011002/#ps345871002

review318011002 updated at https://codereview.tryton.org/318011002/#ps336011006

review318011002 updated at https://codereview.tryton.org/318011002/#ps338051002

review318011002 updated at https://codereview.tryton.org/318011002/#ps338041003

New changeset 813da6b8d1da by Sergi Almacellas Abellana in branch 'default':
Allow productions to be automatically assigned
https://hg.tryton.org/modules/production/rev/813da6b8d1da

added 1 deleted label and removed 1 deleted label

closed

New changeset 695c8ac24f64 by Sergi Almacellas Abellana in branch 'default':
Allow shipments to be automatically assigned
https://hg.tryton.org/modules/stock/rev/695c8ac24f64

New changeset e8530ec870e4 by Sergi Almacellas Abellana in branch 'default':
Allow shipments to be automatically assigned
https://hg.tryton.org/tryton-env/rev/e8530ec870e4

marked this issue as related to #12187

mentioned in issue #13027 (closed)