Who is Stella? The single-named French pop queen was born Stella Zelcer, and is today known as Stella Vander, wife and collaborator of Christian Zander of the jazz-influenced progressive rock group Magma.   Cherry Red’s RPM Records label has recently unearthed the 1967 debut album of the singer then known simply as Stella for an expanded edition which doubles as an anthology of her recordings for the French division of RCA Victor. Stella differentiated herself from the popular yé-yé girls by lampooning the genre itself.  On Stella, which was drawn from previously released…