core (memory/sqla): generic `get` + `session_add` in `delete`: new generic `get` allow to retrieve an ORM object with given column and value, and optionally join load attributes. In `delete`, it is now possible to specify instances to add to session, this allow, to update them in the same transaction. It is also now possible to specify a list of object to delete them all in the same transaction. rel 367

You'll find install instructions in documentation (see doc/installation.rst).

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