Fix ownertrust display with --with-colons.

Properly initialize the user ID refcount for user and photo IDs.

Tweak a few prompts to change "y/n" to "y/N", which is how most other
prompts are written.

Warn the user if they are about to revoke an expired sig (not a problem,
but they should know).

Control-d escapes the keyserver search prompt.

If a subkey is considered revoked solely because the parent key is
revoked, print the revocation reason from the parent key.

Allow revocation/expiration to apply to a uid/key with no entry in the
trustdb.

g10/keygen.c

@@ -1280,6 +1280,7 @@ generate_user_id()
     uid = m_alloc_clear( sizeof *uid + n - 1 );
     uid->len = n;
     strcpy(uid->name, p);
+    uid->ref = 1;
     return uid;
 }