[FIX]Fixe the issue o2m record duplication.
[FIX]Refixed the issue of o2m record duplication
Merge pull request #221 from odoo-dev/7.0-o2m-duplication-issue-msh

[FIX] Fix o2m record duplication when clicking on a button

The button action will execute a write call, creating the new line.
The reload is necessary to avoid recreating the line when using the save button.
Subtree merged in odoo/7.0