Add share_user support to shiphead.
Add share_user support to Invoice and SO ListItem.
Merge remote-tracking branch 'XTUPLE/4_5_x' into shipment_share
Merge remote-tracking branch 'XTUPLE/4_5_x' into shipment_share
Merge remote-tracking branch 'XTUPLE/4_5_x' into shipment_share
Fix build error.
Fix invoice test.
Merge pull request #1504 from bendiy/shipment_share

Add share_user support to shiphead, invoicelistitem and solistitem