* scd/app.c (app_dump_state): Also print the refcount.
(maybe_switch_app): Make sure the app exists on the card.
--
When switching the current card and the card does not support the same
apps as the former, we now reset the app to the first one.
Testcase is to use a standard OpenPGP card and a P15 card.
Signed-off-by: Werner Koch <wk@gnupg.org>