Plot recipes improvements

[gabrevaya]

• Added powerspectrumplot methods for plotting precomputed power spectra
• Changed normalization (to dB) and offset (0 at the start of the plot) to match Adam et al. (2022), which seems more convenient for plotting multiple power spectra
• Improved calculation of limits and band label positions

@helmutstrey, please let me know if these new plot recipes are what you need.

You can pass either a single power spectrum object (of type DSP.Periodograms.Periodogram) or a vector of them. For example:

powspec1 = powerspectrum(msn, sol, "G", method=welch_pgram, window=hanning)
powerspectrumplot(powspec1)

powspec2 = powerspectrum(msn, sol, "V", method=welch_pgram, window=hanning)
p = [powspec1, powspec2]
powerspectrumplot(p)

Helmut, you also suggested creating a plot recipe for individual neurons' voltages. I want to make sure I understood correctly: Would you like to pass a blox and a sol, similar to the other plot recipes, while indicating the indices of individual neurons to be plotted, all superimposed? So this should be similar to the stackplot but without the vertical shift and with selective neuron plotting, right?

[gabrevaya]

@helmutstrey, would you like to modify anything from this, or should we already merge it?

[harisorgn]

Nice one @gabrevaya

[gabrevaya]

Thanks @harisorgn!