** Cleanup all the GC_ mark bit stuff -- there is no longer any distinction
since the mark bit is no longer stored in the Lisp_Object itself.
+** Refine the `predicate' arg to read-file-name.
+ Currently, it mixes up the predicate to apply when doing completion and the
+ one to use when terminating the selection.
+
** Merge ibuffer.el and buff-menu.el.
More specifically do what's needed to make ibuffer.el the default,
or just an extension of buff-menu.el.