Handle non-readable directories.
(ido-decorations): Add 9th element for non-readable directory. (ido-directory-nonreadable): New dynamic var. (ido-set-current-directory): Set it. (ido-read-buffer, ido-file-internal): (ido-read-file-name, ido-read-directory-name): Let-bind it. (ido-file-name-all-completions1): Return empty list for non-readable directory. (ido-exhibit): Print [Not readable] if directory is not readable. (ido-expand-directory): New defun (based on tiny fix from Karl Chen). (ido-read-file-name, ido-file-internal, ido-read-directory-name): Use it.
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