* src/gen/db/base.py: allow not to create gramps_id on add
* src/GrampsDbUtils/_ReadXML.py: on sourceref, don't create gramps_id
* src/GrampsDb/_GrampsInMemDB.py: remove gid from memory map only if not None
svn: r9119
(_load_metadata): Load from tuple;
* src/gen/db/base.py (GrampsDbBase.set_researcher): Move details
to the Researcher class.
(set_from): Add method;
(__init__): Copy from source if provided.
svn: r9104
