fix extid handling: ensure encoded string is given, and store them as base64 (see note in native.py).
Bump version to force migration on dev instances.
"""pre 3.2 bw compat"""# pylint: disable-msg=W0614,W0401fromwarningsimportwarnwarn('moved to cubicweb.appobject',DeprecationWarning,stacklevel=2)fromcubicweb.appobjectimport*