[xmonad] darcs patch: Ignore cloned screens (and 3 more)

Hi, I’m resubmitting these patches, as I did not receive any comments on them. If there is a problem with them, please tell me, and I can try to fix it. Greetings, Joachim Mon Dec 31 19:06:28 CET 2007 Joachim Breitner * Ignore cloned screens This patch ignores screens that are just clones of existing ones, or are completely contained in another. Currently only for rescreen, not yet for xmonad start. Mon Dec 31 19:15:56 CET 2007 Joachim Breitner * Put the screen removing stuff in getCleanedScreenInfo Mon Dec 31 19:21:31 CET 2007 Joachim Breitner * use getCleanedScreenInfo in Main.hs as well This might be a bit ugly, but it was the least invasive way to get the list of ScreenIDs into the StackSet. Mon Dec 31 19:24:54 CET 2007 Joachim Breitner * Adjust test for the ScreenId passing