Returns the current number of plusses for the item in the specified equipment
slot. For a list of equipment slots see 'getequipid'.

Can be used to check if you have reached a maximum refine value, default for
this is +10:

if(getequiprefinerycnt(1) < 10) goto L_Refine_HeadGear;
mes "Sorry, it's not possible to refine hats better than +10";
close;
L_Refine_HeadGear:
mes "I will now upgrade your "+getequipname(1);