We can get everything we need directly from TypecheckedModule.

Simon Hegel's patch prompted me to do some refactorings in Main,
Haddock.Documentation and Haddock.Interface. 

	javascript code for collapasble sections cleaned up
	rewrote class utilities in javascript to be more robust
	refactored utilities for generating collapsable sections
made toc be same color as synopsis
module list has needed clear attribute in CSS

	moved to javascript, so as to not polute the content with the style menu
	removed menu building code in Themes.hs
	removed onclick in Utils.hs
changed text of button in header from "Source code" to "Source"
	more consistent with links in rest of page

	headings in interface lost thier a element, no need, just put id on heading
	css for a elements now only applies to those with href attribute

	don't generate an empty li for absent style menu in links area
	update css for Classic and Snappy to handle:
		dl lists
		links in package header and in declarations
		floating of links and info block in package and module headers

  make whole .caption be the target
  improve javascript for class toggling
  have plus/minus images come from .css, not img tags

  decided that --themes was silly - no one would do that, just use
    multiple --theme arguments
  made --theme a synonym for --css and -c
  made those arguments, if no file is found, look up the argument as the
    name of a built in theme

  all of this let's haddock be invoked with "--theme=classic" for example.

  The bulk of the change is threadnig the selected theme set through functions
  in Xhtml.hs so that the selected themes can be used when generating the page
  output. There isn't much going on in most of these changes, just passing it
  along. The real work is all done in Themes.hs.