Run admin/update-copyright.

(cusver-check): Interactively, require existing directories.

* admin/cus-test.el: Comment.

* lisp/cus-start.el (truncate-partial-width-windows): Fix type.

* lisp/emulation/viper-init.el (viper-search-scroll-threshold): Fix type.

* lisp/mail/feedmail.el (feedmail-confirm-outgoing)
(feedmail-display-full-frame, feedmail-deduce-bcc-where): Fix types.

* admin/admin.el: Related comments.

* admin/cus-test.el (cus-test-cus-load-groups): New function.
(cus-test-get-options): Add option to return groups.
(cus-test-noloads): Also check custom groups.

* admin/cus-test.el (cus-test-get-lisp-files): Ignore obsolete/.
(cus-test-libs): Fix let-binding of default-directory.
(cus-test-noloads): Load all libs for the comparison.

* admin/cus-test.el (cus-test-libs-noloads): Add a few more files.
(cus-test-load-libs, cus-test-opts):
Add option to load more/all Lisp files.
(cus-test-get-lisp-files): Ignore .*.el files.

* admin/cus-test.el (cus-test-libs-noloads): Add some files.
(cus-test-get-lisp-files): New function.
(cus-test-libs): Add option to load more/all Lisp files.

Mainly for some files listed in loaddefs.el now being in subdirs that
are not in load-path.

* admin/cus-test.el (cus-test-libs-noloads): Add dunnet in the defvar.
(dunnet): Don't always load it.
(viper-mode): Only set if interactive.
(cus-test-load-custom-loads): Load dunnet if necessary.
(cus-test-load-1): New macro, with common code from cus-test-load-libs
and cus-test-libs.
(cus-test-load-libs, cus-test-libs): Use cus-test-load-1 macro.
Update for cus-test-get-autoload-deps changed result.
(cus-test-get-autoload-deps): Simplify.  Return file names as they
appear in loaddefs.el (directory parts are needed now that not all
lisp subdirs are in load-path).
(cus-test-deps): Explicitly skip dunnet.

Remove some outdated comments.