Extend ctlike to do TS calculation - issue 1244
fix removing sources from model
Added TS calculation
Added TS, but storing not working yet
TS calculation done
First version of high-level plotting script: plotutils.py for skymaps. This script uses matplotlib and APLpy
ctselect does now not enforce ROI cut, this is needed for spectral point generation
Merge branch '1244-extendgtlike' of https://cta-git.irap.omp.eu/ctools into 1244-extendgtlike
restore best fit values after TS calculation
Added todo comment for refitting in ctlike
Spectrum points
Merge branch '1244-extendgtlike' of https://cta-git.irap.omp.eu/ctools into 1244-extendgtlike
Added comment on Prefactor
Merge branch 'integration' into 1244-extendgtlike

Conflicts:
	scripts/obsutils.py
Make TS computation optional.
Move plotutils script to pyext/ctools folder
Adapt code
Remove new code before it gets corrected