Johan Bregeon / ctools

There was a code duplication in csroot2caldb and csobs2caldb, which is now avoided by exporting the code in the "calutils" module.

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.