Joan Greenwood Plays a Cat -- Joan Greenwood, slinkiest of British stage and film stars, has achieved her life long ambition to play a cat. The play, now being tried out in Edinburgh before a London Season, is The Moon and the Chimney by Hungarian playwright Ladislas Fodor. The scene is the Paris studio of a young American artist. Into it, to disrupt his work and his love life, there purrs the inimitable Miss Greenwood, as Selina, whose multiple transmigrations in a good many more than nine lives down the ages have finally brought her to womanhood. But Selina never forgets that she is a cat first and foremost - whatever from her latest reincarnation may bring her. The role gives Joan Greenwood full scope for the grace and witty malice tha