New portal linking command.

Idk about other map makers, but I find having to first find a fortress that links up to the biome you want rather tedious. So, my proposal is this. A command that can link nether portals even if they should not be linked. What I mean is that you can link a portal in the overworld by giving it a specific name, and linking it to one with "specific name:b". This may sound a bit ludicrous to normal players, but I think it could make map development a bit easier