(no title)

Note: I have not fully tested the new key creation due to a pc/sc
error. However the backupfile has been created successfully.

• rsa.c (rsa_generate): Return the dummy list of factors only if

the caller asked for it.

• card_util.c (generate_card_keys): ask whether backup should be

created.
(card_store_subkey): Factored some code out to ..

• keygen.c (save_unprotected_key_to_card): .. new function.

(gen_card_key_with_backup): New.
(generate_raw_key): New.
(generate_keypair): New arg BACKUP_ENCRYPTION_DIR. Changed all
callers.
(do_generate_keypair): Divert to gen_card_key_with_backup when
desired.