flint: Allow to select x-axis with plotselect
Feedback from @berruyer
Gilles provides a bunch of scans for the monochromators.
He expect that the users will select different x-axis depending on the use case.
plotselect(x=mono_counter)
monoscan(...)
We also expect an easy way to revert it
- From flint -> reset as it is done for y selection
- Maybe
plotselect(x=None)
from the command line