* call-agent.c (start_agent): Create and pass the list of FD to
keep in the child to assuan.
* call-dirmngr.c (start_dirmngr): Ditto.
* scdaemon.c (main): Use GNUPG_DEFAULT_HOMEDIR constant.
* assuan-pipe-connect.c (assuan_pipe_connect): No special handling
for the log_fd and stderr. Connect stderr to /dev/null if it
should not be retained.
* card.c (card_open): set it here.
* card-p15.c (p15_prepare_key): Factored out common code from ...
(p15_sign, p15_decipher): here and made the decryption work the
regular way.
