Pierrick Martin / ctools

These errors showed up when importing matplotlib before gammalib

This ensures the SED fits files are consistent with the current suggested data format

Update 'show_spectrum.py' to also plot the spectral profiles

Allows plotting significance distribution without saving exclusion/inclusion regions or output of ctskymap first

Allows generating residuals plots without having to save csresspec output

Allows extracting SED parameters for plotting

Allows extracting butterfly parameters for plotting

Change default source to plot MAXSIGPIXEL since SOURCE may not exist in output file