- Abolish function `mime-raw-find-entity-from-node-id',

- Abolish function `mime-raw-find-entity-from-node-id',
  `mime-raw-find-entity-from-number'.
- Move function `mime-entity-parent' to mime.el of FLIM.
- Abolish variable `mime-view-uuencode-encoding-name-list'.
- Move function `mime-entity-uu-filename' and `mime-entity-filename'
  to mime.el of FLIM.
(mime-preview-follow-current-entity): Use function
`mime-find-entity-from-node-id' instead of
`mime-raw-find-entity-from-node-id'.
(mime-preview-move-to-upper): Don't use
`mime-raw-find-entity-from-node-id'.