Created "configurable tidy" todo item.

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+[[!tag patch patch]]
+
+I was trying to get htmltidy to [play nicely with MathML][play].  Unfortunately, I couldn't construct a command line that I was happy with, but along the way I altered htmltidy to allow a configurable command line.  This seemed like a generally useful thing, so I've published my [patch][] as a Git branch.
+
+[play]: http://lists.w3.org/Archives/Public/html-tidy/2006JanMar/0052.html
+[patch]: http://www.physics.drexel.edu/~wking/code/git/git.php?p=ikiwiki.git&a=commitdiff&h=408ee89fd7c1dc70510385a7cf263a05862dda97&hb=e65ce4f0937eaf622846c02a9d39fa7aebe4af12