rework annex-ignore handling

Only one place need to filter the list of remotes for ignored remotes:
keyPossibilities. Make the full list available to everything else.

This allows getting rid of the special case handing for --from and --to
to make ignored remotes not be ignored with those options.

Remote/Git.hs

@@ -71,7 +71,8 @@ gen r u _ = do
 		removeKey = dropKey r',
 		hasKey = inAnnex r',
 		hasKeyCheap = cheap,
-		config = Nothing
+		config = Nothing,
+		repo = r'
 	}
 
 {- Tries to read the config for a specified remote, updates state, and