(tumme-write-tags): Add.

(tumme-write-tags): Add.
(tumme-write-comments): Add.
(tumme-tag-files): Change to use `tumme-write-tags'.
(tumme-tag-thumbnail): Change to use `tumme-write-tags'.
(tumme-dired-comment-files): Change to use `tumme-write-comments'.
(tumme-save-information-from-widgets): Change to use
`tumme-write-comments' and `tumme-write-tags'.
(tumme-comment-thumbnail): Change to use `tumme-write-comments'.