Merge changes made in Gnus trunk.

Merge changes made in Gnus trunk.

sieve.el (sieve-buffer-script-name): New local variable to store sieve script name.
 (sieve-edit-script): Store sieve script name.
 (sieve-upload): Use sieve script name when uploading.
 (sieve-upload): Use substitute-command-keys.
 (sieve-edit-script): Use substitute-command-keys.
 (sieve-refresh-scriptlist): Use substitute-command-keys.
 (sieve-manage-mode-map): Define keymap properly.
 (sieve-manage-mode): Do not set mode name manually, change mode-name to
 (sieve-refresh-scriptlist): Use substitute-command-keys."Sieve-manage".  Remove commented code about cvs.
 (sieve-manage-quit): New function.
 (sieve-manage-mode-map): Bind 'q' to sieve-manage-quit.
gnus-gravatar.el: Use gnus-with-article-buffer.
gnus-art.el (gnus-with-article-buffer): Check that the gnus-article-buffer is alive.