[IMP] replace a manual & eager concat by chain.from_iterable(iter) -> iter
[FIX] views: when loading an action, the active_* parameters should overwrite previous context
Merge pull request #925 from xmo-odoo/master-concat-itertools-xmo

Replace NIH concat function
Merge branch 'master' of https://github.com/odoo/odoo into master-linux64