When not run in a git repository, git-annex can still display a usage message, and "git annex version" even works.

Things that sound simple, but are made hard by the Annex monad being built
with the assumption that there will always be a git repo.

Types/Command.hs

@@ -33,6 +33,7 @@ type CommandCleanup = Annex Bool
 
 {- A command is defined by specifying these things. -}
 data Command = Command {
+	cmdnorepo :: Maybe (IO ()),
 	cmdcheck :: [CommandCheck],
 	cmdname :: String,
 	cmdparams :: String,