Red Sky in Morning by Paul Lynch Little, Brown and Company, $25.00, 275 pages, ISBN 978-0-316-23025-4 There’s an old Irish joke Michael Curley told me a number of years ago that goes like this:  How can you tell when an Irishman is losing his mind?  He forgets who he has grudges against!  It’s a joke that’s all the funnier because there’s an element of truth to it.  The Irish