- Don't require `mmgeneric' and `mime-parse'.

- Don't require `mmgeneric' and `mime-parse'.
- Require mime.
- Use `luna'.
(mime-buffer-entity-buffer-internal): Renamed from
`mime-entity-set-buffer-internal'.
(mime-buffer-entity-set-buffer-internal): Likewise.
(mime-buffer-entity-header-start-internal): Likewise.
(mime-buffer-entity-set-header-start-internal): Likewise.
(mime-buffer-entity-header-end-internal): Likewise.
(mime-buffer-entity-set-header-end-internal): Likewise.
(mime-buffer-entity-body-start-internal): Likewise.
(mime-buffer-entity-set-body-start-internal): Likewise.
(mime-buffer-entity-body-end-internal): Likewise.
(mime-buffer-entity-set-body-end-internal): Likewise.
(mime-entity-name): New method.
(mime-parse-multipart): New function [moved from mime-parse.el].
(mime-parse-encapsulated): Likewise.
(mime-parse-message): Likewise.
(mime-entity-children): New method.
(mime-goto-header-start-point): New method.
(mime-visible-field-p): New function [moved from mmgeneric.el].
(mime-insert-header-from-buffer): Likewise.
(mime-insert-header): New method.
(mime-entity-content): Use `luna-define-method'.
(mime-insert-text-content): New method.
((mime-entity-fetch-field): Use `luna-define-method'.
(mime-entity-header-buffer): New method.
(mime-entity-body-buffer): Likewise.
(mime-entity-buffer): Likewise.
(mime-entity-point-min): Use `luna-define-method'.
(mime-entity-point-max): Use `luna-define-method'.
(mime-parse-buffer): New function [moved from mmgeneric.el].