Add Wolfram Alpha query

dotfiles/saturnin/www.ini

     sf      = http://slovnik.cz/bin/mld.fpl?dictdir=frcz.fr&lines=90&vcb=%s
     tfd     = http://www.thefreedictionary.com/%s
     w       = http://en.wikipedia.org/wiki/%s
+    wa      = https://www.wolframalpha.com/input/?i=%s