Gives miners and virologist access to the science channel

Adds mining headset and encryption key with access to the science channel, using unused sprites, so scientists can communicate with miners more easily.
Gives the virologist a medical research headset, so they can ask miners for plasma.
Makes "medical" rather than "science" the medical research encryption key's primary (:h) channel.

Note that the map still needs to be updated to replace the medical headset in virology.