Don't ignore initial punctuation when sorting

Maybe it's getting late, but I couldn't come up with a simpler solution.

![Screenshot of the sort behavior](http://i.imgur.com/WE3mTYM.png)
(note that parentheses are ignored and only underscore is compared)

Closes #514
I'm not sure why preceding spaces shouldn't matter for sorting, since that's a pretty standard hack too. I think we actually trim almost everything on input anyway, which makes this irrelevant, but no reason to trim here, I don't think.