Doc, comment, etc updates for increased use of locate-user-emacs-file

Doc, comment, etc updates for increased use of locate-user-emacs-file

This should have been a prerequisite for making these changes in the
first place.

* doc/emacs/calendar.texi (Time Intervals):
* doc/misc/idlwave.texi (Lesson III---User Catalog, Online Help)
(Starting the Shell, Catalogs, User Catalog):
* doc/misc/remember.texi (Quick Start):
* doc/misc/viper.texi:
* doc/misc/vip.texi (Customization, Customizing Constants)
(Customizing Key Bindings): Update for files being in ~/.emacs.d/.

* lisp/ido.el (ido-save-directory-list-file):
* lisp/saveplace.el (save-place-file):
* lisp/calendar/timeclock.el (timeclock-file):
* lisp/net/quickurl.el (quickurl-url-file):
* lisp/obsolete/otodo-mode.el (todo-file-do, todo-file-done, todo-file-top):
* lisp/progmodes/idlwave.el (idlwave-config-directory):
* lisp/textmodes/remember.el (remember-data-file):
Bump :version.

* lisp/shadowfile.el (shadow-info-file, shadow-todo-file): Doc fix.
* lisp/strokes.el (strokes-file): Doc fix.  Bump :version.
(strokes-help): Doc fix.
* lisp/emulation/viper-init.el (viper-vi-style-in-minibuffer): Doc fix.
* lisp/emulation/viper.el (viper): Doc fix for custom group.
(top-level): Remove oh-so-no-longer-relevant text about vip.
* lisp/obsolete/otodo-mode.el (todo-prefix): Doc fix.

* etc/NEWS: Related edits.