server/web api for accessing to deleted_entites

[R] dataimport: changes - deprecate checkpoint() in favour of commit() - filter on None value in mk_entity - rearrange log messages order

#750055: make it easier to change post logout url

[web auth] fix authentication pb when anonymous are allowed, avoiding the first authentifier to return an anon connection while a following one may find correct authentication info. This make things simpler (eventually)

[web server] simplify base-url handling on startup. Ensure config['base-url'] is correctly set once started

[rql rewrite] until a better solution is found raise BadSchemaDefinition when two inlined relations with security on an optional variable is used, explaining how to bypass it

[rql rewriting] handle case where we've and optional inlined relation in the original query. Also, we should append EXISTS even in subquery to avoid inserting duplicates in results

[rql rewriting] handle case where we want to insert snippet on a variable that has previously been moved to a subquery

backport stable

[backup] fix misplaced paren

fix bad conflict resolution

backport stable