(mime-editor/single-part-tag-regexp): It allows any column.

(mime-editor/single-part-tag-regexp): It allows any column.
(mime-editor/quoted-single-part-tag-regexp): New constant.
(mime-editor/enquote-region): New function.
(mime-editor/dequote-region): New function.
(mime-editor/process-multipart-1): Processing for ``quote'' enclosure
was added.
(mime-editor/translate-body): Use function
`mime-editor/dequote-region'.

(mime-editor/mime-version-value): Comment was renamed.