The Housewives of Mannheim
59E59 Theaters, Off-Bway By Molly Marinik BOTTOM LINE: This new play tackles a touchy subject with a sweet touch. It's a little self-indulgent and doesn't break creative ground in its storytelling, but it's a well-produced glimpse into four complex characters' lives and it offers the right amount of intrigue to keep the audience's attention. Finally, a show for elderly lesbians! If you were around in the 1940…