Merge changes made in Gnus trunk.

Merge changes made in Gnus trunk.

gnus.texi (Summary Mail Commands): Document `gnus-summary-reply-to-list-with-original'.
auth-source.el (with-auth-source-epa-overrides): Fix compilation error with `find-file-hooks' on Emacs 22.
 (with-auth-source-epa-overrides): Ugly hack to Wrap the `find-file-hook' things in `symbol-value' to avoid compilation warnings on all architectures.
spam.el (spam-stat): Require in a normal fashion without binding `spam-stat-install-hooks' to avoid compilation warnings.
spam-stat.el (spam-stat-install-hooks): Removed.
 (spam-stat-install-hooks): Don't run automatically.
gnus-msg.el (gnus-summary-reply-to-list-with-original): New command and keystroke.