* spam.el (autoload): autoload the gnus-registry functions we'll

* spam.el (autoload): autoload the gnus-registry functions we'll
need
(spam-log-to-registry): new variable for interfacing with the
gnus-registry
(spam-install-hooks): variable had the wrong customization group
(spam-fetch-field-message-id-fast): convenience function for fetch
a message ID quickly
(spam-log-processing-to-registry): new function
(spam-ifile-register-spam-routine)
(spam-ifile-register-ham-routine, spam-stat-register-spam-routine)
(spam-stat-register-ham-routine)
(spam-blacklist-register-routine)
(spam-whitelist-register-routine)
(spam-bogofilter-register-spam-routine)
(spam-bogofilter-register-ham-routine)
(spam-spamoracle-learn-ham, spam-spamoracle-learn-spam): add
spam-log-processing-to-registry invocations

* gnus-registry.el: fixed docs in the preface to mention
gnus-registry-initialize
(gnus-registry-store-extra): remove cached extra entry
information when new extra entry is stored