SIRCD: Anyone can set umode +o(oper).

I recently accidentially set my own usermode to +o in SIRCD, MODE nick +o, and hey! I was oper! : Versions affected is atleast 0.5.2 och 0.5.3.. The developer has been informed about this, and I assume that it will be fixed ASAP. Here's a quick fix for those who doesnt have time to wait at least ...