Generic connections

[MatthieuDartiailh]

In Lyon there are using Ethernet-GPIB adapter. The address of the instrument is then of the form TCPIP0::192.168.0.254::gpib0,5;;INSTR. This can be supported out of the box by declaring the VisaRaw connection on the driver declaration.
However, for the time being it is not so and it seems absurd to systematically add this declaration to each driver declaration. Furthermore, if one was to add a connection dedicated to this particular bridge, to be useful it would have to be added to each GPIB instrument, which is not practical.
I hence suggest to add a field to the declaration of a Connection, listing the connections it can replace. When a driver register itself, it would then query the additional connections the instrument can support based on the ones it declares and add those.

We may want to let the user choose to only display declared connections or all supported connections, not sure what widget to use however.

Any volunteer to work on this ?