3655 Alphabetize symbols key categories

http://code.google.com/p/otwarchive/issues/detail?id=3655

List was originally in alphabetical order, but by a different set of words:
* Femslash
* Gen
* Het
* Multi
* Other
* Slash
* [None] -- last because it's not actually a tag category

Now it should be in alphabetical order by the words actually written there:
* F/F
* F/M
* Gen
* M/M
* Multi
* Other
* [None] -- last because it's not actually a tag category