New speedbar version

[Chong Yidong]

A new version of speedbar.el has been checked in.  It depends on three new
files: dframe.el, ezimage.el, and sb-image.el, which have been added to
the CVS repository.  The lisp/sb-*.xpm images have been removed, and a new
set of image files has been added in the directory etc/images/ezimage.

Please use `cvs -Rd up' to get the new files, and make bootstrap.  It
would be good if people could test the new speedbar version and see if
there are any compatibility problems.

Thanks.