backport stable

3.6 api update

[vreg] object_by_id should not have been deprecated. Fix facets. it was *designed* to be able to force an object retreival when selection is potentially not possible. For instance using select instead of object_by_id in get_facet totally breaks the implementation since in get_facet we've not context result set, and we ends up with a NoSelectableObject exception.

fix stupid typo ...

fix condition to paginate a result set

make rollback available in shell (as commit is)

add a reminder

fix indentation / tab pbs

fix name error

add approximated version number to deprecation warning

oops, missing return

we need extrapath when trying to import site_cubicweb files

move extra path computing as a configuration class property so we can reused it

first draft for a simple hooks based custom attribute storage, with a BytesFileSystemStorage POC implementation. Basically: * a dictionary contains maps from which attribute of which entity types are mapped to which custom storage * hooks check for one of these entity type being added/modified/deleted * read is based on the sql generator callback mecanism (used in vcsfile for instance) * all storages have the same basic interface (read, add, update, delete), and should be pluggable in a transparent way (except at migration time when one want to change from a storage to another) * the sample BytesFileSystemStorage: * may store Bytes attributes content of any entity type as file on the file system * is based on one FSPATH rql/sql function and another _fsopen only available in sql * has a dumb file name allocation algorithm