* wl/wl-vars.el (wl-icon-dir): Fixed the docstring.

* wl/wl-vars.el (wl-icon-dir): Fixed the docstring.

* wl/wl-demo.el: Require `path-util'.
(wl-demo-bitmap-mule-available-p): New internal variable.
(wl-demo-image-type-alist): Use it;
 don't require `bitmap', use `module-installed-p' instead.
(wl-demo-insert-image): Use *.img file for a bitmap image.
(wl-demo): Don't call the ascii demo recursively.

* WL-MK (config-wl-pixmap-dir): Set a value to `PIXMAPDIR' even if Emacs
 version is less than 21.
(install-wl-icons): Install icon files which might be used for the running
 version of Emacs.