Known For Baroque Opera, She’s Praised For Book, Too Jane Glover Hit Author With ‘Handel In London’ By LIBBY CUDMORE CHERRY VALLEY – Fixing up a guest house in Cherry Valley, Graham Humes was worried what his summer tenant, Jane Glover, in town to conduct “L’Incoronazione di Poppea” at the 1994 Glimmerglass Festival, might think. “I was afraid she wouldn’t like it!” he said. “But we got a piano in there for her, and she was very happy.” So happy, in fact,…