Add supplier and contact address to shipment in returns

To be able to know to which supplier we return the goods, the shimpent in returns must have a supplier field.

The attached review implements it.

assigned to @pokoli

added stock type::feature + 1 deleted label

Purchase module is also afected as it must fill the supplier and the address when creating a return

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I added review22831002 for purchase

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New changeset a0cc03e07bb9 by Sergi Almacellas Abellana in branch 'default':
Add supplier and delivery address on supplier shipment return
http://hg.tryton.org/modules/stock/rev/a0cc03e07bb9

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closed

New changeset 52bdbc6c61e0 by Sergi Almacellas Abellana in branch 'default':
Add supplier on shipment in returns
http://hg.tryton.org/modules/purchase/rev/52bdbc6c61e0

I reopen it because migration fails as explained on http://www.tryton.org/~irclog/latest.log.html#t2016-03-18%2011:15

review17971004 fixes it.

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reopened

New changeset fcbdc59e7706 by Sergi Almacellas Abellana in branch 'default':
Fix migration of new supplier field on shipment in returns
http://hg.tryton.org/modules/purchase/rev/fcbdc59e7706

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closed