[entity] add a "repo_side" parameter to `_cw_dont_cache_attribute`
This parameter (defaulting to `False`) is used to inform cubicweb that we really
really do not want to cache a value during creation or update. This will be used
by a storage that may do very specific processing on attribute values that result
in a stored value different than the provided one (e.g. BFSS `fs_importing`
mode).
What's new in CubicWeb 3.16?
============================
New functionnalities
--------------------
* Add a new dataimport store (`SQLGenObjectStore`). This store enables a fast
import of data (entity creation, link creation) in CubicWeb, by directly
flushing information in SQL. This may only be used with PostgreSQL, as it
requires the 'COPY FROM' command.
API changes
-----------
Unintrusive API changes
-----------------------
* Drop of `cubicweb.web.uicfg.AutoformSectionRelationTags.bw_tag_map`,
deprecated since 3,6.
User interface changes
----------------------
* Remove changelog view, as nor cubicweb nor known cubes/applications were properly
feeding related files