Weak keep (and possibly other non-standard !votes) not counted

[NovemLinguae]

*'''Weak keep'''. is not showing up at https://afdstats.toolforge.org/afdstats.py?name=Joe+Roe&max=500&startdate=&altname=

Perhaps we should double check that weak keep, week delete, strong keep, and strong delete (case insensitive) are counted. And if not, we should add support for this. They're common, and coding it would be easy.