* spam.el (spam-use-spamoracle): new variable

* spam.el (spam-use-spamoracle): new variable
(spam-install-hooks): add spamoracle to the list of conditions
for activation of spam-install-hooks
(spam-spamoracle): new variable customization group
(spam-spamoracle, spam-spamoracle): new variables
(spam-group-spam-processor-spamoracle-p)
(spam-group-ham-processor-spamoracle-p): new functions
(spam-summary-prepare-exit): added spamoracle ham/spam exit processing
(spam-list-of-checks, spam-list-of-statistical-checks): add
spam-use-spamoracle
(spam-check-spamoracle, spam-spamoracle-learn)
(spam-spamoracle-learn-ham, spam-spamoracle-learn-spam): new functions

* gnus.el (gnus-group-spam-exit-processor-spamoracle)
(gnus-group-ham-exit-processor-spamoracle): new variables for SpamOracle
(spam-process, ham-process): added spamoracle spam/ham processors