[Eeglablist] using linear instead of log scale for std_erspplot and std_plottf

[Eric Landsness]

I have been using the std_erspplot function (which calls std_plottf) to plot the ERSP on my *.study.  However, the default frequency axis seems to be logarithmic.  Is there an optional input to change the scale to linear?

Thanks,
Eric