net-p2p/microdc: port is no longer in development, but there is a successor

[Pankov Pavel]

The port net-p2p/microdc is no longer in development and it's author 
recommends to use more functional and supported fork called microdc2 
instead (see http://www.nongnu.org/microdc/ and 
http://corsair626.no-ip.org/microdc/).

I'm currently the maintainer of net-p2p/microdc and like to move to 
microdc2, but I don't know how to be with the port. I can see several 
posibilities:
1) net-p2p/microdc can be simply updated to microdc2's latest version 
(IMO it's bad: package/port name would be microdc instead of logical 
microdc2)
2) net-p2p/microdc can be repo-copied to something like 
net-p2p/microdc2, which later will be updated to microdc2's latest version
3) add new port net-p2p/microdc2 with the microdc2 fork (and 
net-p2p/microdc can be optionally marked as depriciated in favour of 
net-p2p/microdc2)

As for me, I prefer the 3) variant, but I'm sure this isn't the first 
dead project and there is some examples that should be done in such cases.