* packet.h, getkey.c (fixup_uidnode), keyedit.c (show_prefs): Show assumed

prefs for hash and compression as well as the cipher pref. Show assumed
prefs if there are no prefs at all on a v4 self-signed key.

* options.h, g10.c (main), sign.c (make_keysig_packet): New
--cert-digest-algo function to override the default key signing hash
algorithm.

g10/packet.h

@@ -171,6 +171,7 @@ typedef struct {
     prefitem_t *prefs;    /* list of preferences (may be NULL)*/
     int mdc_feature;
     u32 created;          /* according to the self-signature */
+    byte selfsigversion;
     char name[1];
 } PKT_user_id;