Show radio protocol in additional column

[drws]

There's a piece of information that LinSSID can show (I think it's off by default), but Sparrow-WiFi is missing. It's a radio protocol indication (a, b, g, n, ac, ax), as per the picture:

Two things to mention here:

1. As can be also seen from the picture, some networks are missing this information. First of all, even an empty field is useful to indicate a non-standard network configuration. Secondly, it should be doable to detect protocol(s) from supported MCS list and other network parameters in these cases.
2. LinSSID has a nice middle text alignment in the column so protocol lists can be easily compared between the network. But it could be improved even further by listing the protocols in a positinal list. An example:

  PROTOCOL
a     n ac
  b g n
      n    ax