The name 'probe' (and thus 'probe group') is a relic from the times when
sigrok was mostly about logic analyzers. Nowadays we support a lot more
device types where 'probe' is not really a good term and 'channel' is
much better suited.
This fixes parts of bug #259.
The current vertical division setting (per channel) and the timebase are stored
as a floating point number. This is suboptimal since clients expect us to send
this information to them in form of a rational number.
Store only the index of the current setting since all the supported settings are
already stored inside of an array.
Uwe Hermann
poljar (Damir Jelić)
Martin Ling
poljar (Damir Jelić)