Provide flint api to custom curve axis scale
This can be used this way
DEMO_SESSION [1]: from bliss.common import plot as plot_mdl
...: flint = plot_mdl.get_flint()
...: plotid = flint.get_default_live_scan_plot("curve")
...: curveplot = plot_mdl.flint_plots.CurvePlot(flint, plotid)
DEMO_SESSION [2]: curveplot.set_yaxis_scale("linear")
DEMO_SESSION [3]: curveplot.set_yaxis_scale("log")
I think i will provide a glue API to remove the 4 first lines, but it can be already used if needed.