* gnus.el (gnus-variable-list): removed gnus-registry-alist and

* gnus.el (gnus-variable-list): removed gnus-registry-alist and
gnus-registry-headers-alist from the list
(gnus-registry-headers-alist): removed

* gnus-start.el (gnus-clear-system): no need to clear the
registry, we can do it ourselves
(gnus-gnus-to-quick-newsrc-format): extra parameters so it can be
used by gnus-registry.el

* gnus-registry.el (gnus-registry-cache-file): new file variable
(gnus-registry-cache-read, gnus-registry-cache-save): new
functions
(gnus-registry-cache-whitespace): new function.  From Dan
Christensen <jdc@chow.mat.jhu.edu>
(gnus-registry-save, gnus-registry-read): use the new
gnus-registry-cache-{read|save} functions, and change the name
from gnus-registry-translate-{from|to}-alist
(gnus-registry-clear): fixed so it doesn't refer to old function name