[request] Search from map using GC code

[+lee737]

This is a small thing in a way, but it has always puzzled me why it is so.... on the main homepage, you can search by place or GC code, but on the (pictured) map page (far more useful, and my real homepage) you can only use a place/position, and not a GC code. Surely these could be brought into line?? I often want to look up a cache using a GC code, hardly ever by a coordinate (never) or a state (rare).