For 1.0:

* parse module headers, augment Interface with info from header

* Short contents at the top of each module?

* IDoc compatibility, as far as possible

* named chunks of documentation?

* sort the names in the module tree

* Handle parse errors better in doc strings

* Do the unlitting/CPPing from Haddock itself

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Post 1.0:

* pay attention to import specs!

* instances: list relevant instances in the documentation for classes and
  datatypes.

* include file revision info in module headers

* handle scoped type variables in the parser

* Allow fully hiding modules from the output

* Add a link to the defining location of a re-exported entity

* fixities

* we don't deal with records properly - exporting record selectors etc.

* doc strings for: function arguments

* remove the s/r conflicts I added to the grammar

* check handling of special types ([], (), (,) etc.)

* Horizontal lines?

* enhance the doc string parser:
	* @...@ for monospaced text
	* an apostrophe inside a string shouldn't be considered to be a quote

* Do proper dependency analysis rather than relying on laziness to
  sort it out.

* clean up the layout: don't use table cellspacing, use CSS instead