Intern source images before any operation on them.

Functions must operate on store items and produce store items. Thus,
the set of store items is closed under the function. This closure
frees the function to not care about the origin of the store item.
Thus, the store item becomes a mere value to be passed around, rather
than a place with special meaning.

* ennum.el (ennum-publish-image): Only accept interned images.
(ennum-publish-link, ennum-publish): Intern images before passing them
to ennum-publish-image.

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