Marianne Lemoine / ctools

…how_obs-example-script

…how_obs-example-script

So far, all pipeline example scripts are included in the unit test. Results are not yet checked, but it is assured that all scripts execute without any error.

Convert the cta_root2caldb.py script into a cscript and add unit test. The script only works if PyROOT is installed.

Instead of the cta_root2caldb.py script a generate_prod3_irf.py script was added to the example folder.

The start time tstart was reused for the computation of the start time of the function execution, leading to invalid time intervals in the ctobssim step.