WinHugs, options dialog Haskell 98 mode

[Neil Mitchell]

Hi,

This patch implements the first page of the options dialog, including
overlapping instances, here documents and haskell 98 mode. This does
allow changing between haskell98 and not at runtime, but I have marked
it with the warning "requires restart". This is not entirely true...

If you load a non-haskell 98 doc with +98, it fails. If you then go to
options and set -98, then either :l or :r, it succeeds. If you then go
to options and flip back to +98, :r succeeds (wrongly), but :l fails.

Thanks

Neil
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