[dwm] Markdown-like filter written in awk

This awk filter was written to replace markdown.pl from diri. I think
it works (I have tested it with some of the pages in the wiki), but I
ask everybody to test it and review it. I am not an awk expert and I'm
sure things can be done in a better way (the links implementation is a
bit tricky, for example). There are some markdown features which are
missing, but if they are needed probably they could be added.
I hope to see your comments, ciao!

-- 
- yiyus || JGL .