* configure.ac: Required newer versions of some libraries.

* misc.c (openpgp_pk_algo_usage): Allow AUTH where SIGN is allowed.

* keygen.c (ask_passphrase): No need to allocated S2K in secure
memory.

* scdaemon.c (main): --pcsc-driver again defaults to pcsclite.
David Corcoran was so kind to remove the GPL incompatible
advertisng clause from pcsclite.
* apdu.c (apdu_open_reader): Actually make pcsc-driver option work.

scd/scdaemon.c

@@ -277,8 +277,7 @@ main (int argc, char **argv )
   may_coredump = disable_core_dumps ();
 
   /* Set default options. */
-  opt.pcsc_driver = NULL; /* We can't use libpcsclite due to license
-                             conflicts. */
+  opt.pcsc_driver = "libpcsclite.so"; 
 
 
   shell = getenv ("SHELL");