Attached, a patch to add initial enchant support.

This seems to work fine with one major limitation: at present there's no
dictionary auto-discovery, and as the built-in ispell-dictionary-alist is
all 8-bit encodings, while enchant is UTF-8, without some manual
configuration the dreaded "misalignment errors" occur.

I shall add dictionary listing support.

I have already added replace-for-session ("$$ra") to my enchant patch, so
enchant can use this functionality in ispell.el.

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