Correctly filter instrument and id attributes in ctobssim.

The instrument and id attributes provided by an observation were not considering when simulating source and background events. This has been changed now that only events will be simulated when the instrument and id are valid for a given model.
Adapt script to gammalib-00-08-00 version.

When releasing ctools-00-07-00 we forgot to update the script.
Make effective area histogram rebinning optional.
CTA dummy reponse now installs in share/caldb/data/cta/dummy/.

The default CALDB data structure is data/<mission>[/<instrument>]. This structure is now respected.
Add database for DESY Prod2 files.
Update for Prod2 and add obsid to index file for selection.
Add energy dispersion information to CIF file.
Implement King profile PSF, Prod1 and test IRF production.
Adapt to new GCaldb interface.

A new logic has been implemented concerning the caldb parameter. If the name specified by caldb is a directory, the directory is set as the root directory of the calibration database. The file specified by irf must then be a file provided within this root directory.

If the name is not a directory it is used as the mission name that is used to build the calibration directory path. The irf is then the response name.
Calibration database parameters are still automatic.

We don't want to hide these parameters but parse for the instrument.
Update
Update version numbers
Changed GCaldb::dir() to GCaldb::rootdir().
Set precision for logL and number of events logs.
Dump total number of simulated counts in log file.
Update for release.
Make configuration of ctools mandatory (needed for test scripts)
Adapt to new GCaldb interface.