* trustdb.h, trustdb.c (register_trusted_keyid): New.  Adds a keyid to the
list of ultimately trusted keys.
* keygen.c (do_generate_keypair): Use it here so that the ultimate
ownertrust happens before the trustdb (might be) rebuilt.  Also fix an
error where the newly generated pk is thought to be a subkey by the
trustdb.
* g10.c (main): Fix --export-all do actually do something different than
--export.
* pkclist.c (build_pk_list): Show all recipients rather than showing each
recipient as they are added.
* mainproc.c (proc_symkey_enc, proc_encrypted): Keep a count of the number
of passphrases that can decrypt a symmetric or mixed symmetric/pk message
and include it in the list of keys shown to the user.