memstore: change internal prefix to avoid collisions with user's data
memstore: change internal prefix to avoid collisions with user's data

pombredanne/cayley,cayleygraph/cayley,kortschak/cayley,kortschak/cayley,kortschak/cayley,cayleygraph/cayley,kortschak/cayley,kortschak/cayley,pombredanne/cayley,pombredanne/cayley,pombredanne/cayley