Change CDS_FFdbCopyCell to return copiedList so we have the
latest value. Otherwise, some cells may get copied more than once.
Also change to use setof(i ddGetObj(lib "foo")~>views i~>files)~>name
instead of ddGetObj(lib "foo")~>views~>name. This is to ensure that
we only copy views with real files. Seems like even if a cellview is
deleted, cell~>views may not get updated.