Initial import of microdc2 0.15.6.

Initial import of microdc2 0.15.6.

Packaged and maintained by Dennis den Brok, with small changes by me.
This should fix PR pkg/36887 by Dennis.

microdc2 is the successor of microdc, a command-line based Direct Connect
client written in C and designed to compile and run on modern POSIX
compatible systems.
Direct Connect is a file sharing network made up by hubs, to which
clients can connect. Once connected to a hub, the user can search for
files on the hub or the network, or browse files of other users connected
to the hub.