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/Directory.hs

@@ -57,7 +57,8 @@ gen r u c = do
 			removeKey = remove dir,
 			hasKey = checkPresent dir,
 			hasKeyCheap = True,
-			config = Nothing
+			config = Nothing,
+			repo = r
 		}
 
 directorySetup :: UUID -> RemoteConfig -> Annex RemoteConfig