Make the html valid. Add css and prettify. Make RecentChanges use table for
formatting, and images to indicate web vs svn commits and to link to diffs.

All of this should be doable w/o touching a single line of code, just
editing the [[templates]] BTW.

Current problems:

  * A doctype should be added: do we want XHTML 1.0 or HTML 4.01 Trans as
    default?
    
	Need to choose a doctype that corresponds to what [[MarkDown]]
	generates. For example, it does generate <hr />
	So xhml seems a good fit and I'm going to add that to the
	templates. 
	
	One consideration of course is that regular users might embed html
	that uses deprecated presentational elements like <center>.
	--[[Joey]]
	
  * If XHTML: In templates <hr> should become <hr /> etc.
  * Image wikilinks should provide an alt text (maybe '$filname wiki-image'?).

  	Now it will be the text of the [[WikiLink]], which even allows
	setting a custom alt text like this: \[[my_alt_text|image.png]]
	--[[Joey]]
	
  * &'s in (cgi-)url's must be escaped as &.
  
  	Fixed --[[Joey]]
	
  * [ [inlinepage] ] gets wrapped in <p>...</p> which has a high chance of invalidating the page.

  	Since markdown does this, the only way I can think to fix it is to
	make the inlined page text start with </p> and end with
	<p>. Ugly, and of course there could be problems with
	markdown enclosing it in other spanning tags in some cases.
	I've implemented this hack now. :-/ --[[Joey]]

Test: [validate this page](http://validator.w3.org/check?url=referer)