Alphabetical sort & multicolumns

Hi Dan,

Thanks for your message :) I intended to make a pull request but I have some stuff to do first.

It's my first, I don't really know how it works, so I hope I'm doing it the right way :)

So, I've just make the alphabetical sort an "option", a new "feature" ; it's in the commit:
https://github.com/bricebou/picotags/commit/d79f4429ca9a0cfa20db807efc48ea0ce42c62ff

I've also worked on a multicolumn "support" ; I'm not a developper so maybe it's not very "conventional" but it works ; you can see it there : http://momh.fr/tag/phonetique
The commit is here:
https://github.com/bricebou/picotags/commit/3bc05bd793926953cbac0e8439c9a84699ab4930

Thanks again :)