This attribute is misleading as it is insufficient to correctly upgrade
the database. It only renames the column in the database, but other
operations are needed, like updating the corresponding `ir.model.fields`
record (and its xmlid). The default values and the translations are also
lost during the upgrade.
Moreover, this feature was misused. It was:
- left on fields during multiple versions.
- used on reports (SQL views). This would be ok if the feature was
complete, but, as is, it was useless.
- kept unchanged after a second renaming of the field (which can happen
versions later the first rename).
- used, even when the meaning of the field changed. i.e. the field
`archived` has been renamed to the classic `active`, but the value
in the database should be switched.
Christophe Simonis
886eca0131