Before this rev. one could set the report layout on the company using a
hardcoded list (background, clean, standard, etc.). Other modules (typically
accounting modules) could add options in this list. The used template was built
on the layout key.
Now, the layout is a many2one field to a newly created model `report.layout`,
which is linked to a view with the layout architecture.
This gives more control to customize reports and create a new layout (without
creating a python module that extend the layout selection).
The FieldTimezoneMismatch was redone, but an error was done after the
last code review. With this commit, we fix the mistake (a function is
properly called) and improve the test to make sure we catch such a
regression later.
Christophe Matthieu