per-command options

Finally commands can define their own options.

Moved --format and --print0 to be options only of find.

Types/Option.hs

@@ -0,0 +1,17 @@
+{- git-annex command options
+ -
+ - Copyright 2011 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Types.Option where
+
+import System.Console.GetOpt
+
+import Annex
+
+{- Each dashed command-line option results in generation of an action
+ - in the Annex monad that performs the necessary setting.
+ -}
+type Option = OptDescr (Annex ())