[factoid] Allow users to delete factoids about themselves

[Stefano Rivera]

[17:56] <[UC]tumbleweed> literal V_not_4_vendetta
[17:56] <Dazzle> 0: is not for vendetta, 1: is a homo, 2: is a butpirate, 3: is Kingest, 4: is a man who likes doing other men in the pooper, 5: is a man who loves the holes of other men, 6: is great
[17:55] <[UC]tumbleweed> literal maclarry
[17:55] <Dazzle> 0: is a monkey, 1: is the gheinessness, 2: is a peahen, 3: is who i wanna be when i grow up

maclarry can't delete those himself. I offered to delete them for him, but people will probably set things like that again. (On DC everyone sets factoids like this about everyone else)

So, we should probably allow users to delete/modify factoids where their nick is the name or <nick>.<argument> is the name.