Port-a-med minor (but actually major) fix

[FishDance]

While we're just coming up with ideas, why not have it function as a table? That way it's a bit easier to find places to do surgery, and it meshes nicely with the functions that others have been describing above. I'm not too sure about how balanced that would be, but it does mesh with the "bring medbay to others" style that others seem to favor over the current "bring others to medbay" function of the portamed.