passphrase has been given.
* gpg-agent.texi (Invoking GPG-AGENT): Add a few words about the
expected pinentry filename.
* import.c (parse_p12): Write an error status line for bad
passphrases. Add new arg CTRL and changed caller.
* export.c (export_p12): Likewise.
(main): New option --allow-mark-trusted.
* trustlist.c (agent_marktrusted): Use it here.
* gpg-agent.texi (Agent Options): Add --allow-mark-trusted.
* gpgconf-comp.c: Add --allow-mark-trusted for the gpg-agent.