* gnus-nocem.el (gnus-nocem-verifyer): Default to pgg-verify.

* gnus-nocem.el (gnus-nocem-verifyer): Default to pgg-verify.
(gnus-fill-real-hashtb): Use hash table instead of obarray.
(gnus-nocem-check-article): Fetch the Type header.
(gnus-nocem-message-wanted-p): Fix the way to examine types.
(gnus-nocem-verify-issuer): Use functionp instead of fboundp.
(gnus-nocem-enter-article): Use hash tables rather than obarrays;
 make sure gnus-nocem-hashtb is initialized.
(gnus-nocem-alist-to-hashtb): Use hash table instead of obarray.
(gnus-nocem-unwanted-article-p): Ditto.

* pgg.el (pgg-verify): Return the verification result.