Johan Bregeon / ctools

…d scave() methods to ctool interface. Add read_ahead() method to handle reading of task parameters at the beginning of the task execution. Remove all m_read_ahead members from the derived classes.

…esponse for all CTA observation in the container that have not yet a response using the task parameters.

…bservation::hasresponse()

Still needs to be seen how the error computation can be switched off for recomputation.

Conflicts:
	ChangeLog
	scripts/cta_root2caldb.py
	src/ctlike/ctlike.par
	src/ctobssim/ctobssim.par

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.

GammaLib is undergoing a major interface change which requires adaption of the ctools code.

ctlike now computes the observed number of events and dumps the information just before the predicted number of events into the log file. The difference between the observed and predicted number of events is also given so that one knows immediately if the fit behaved as it should.

This commit closes actions #87 and #88 and the feature #54.

…to understand for the user.

Instead of reading ahead the output parameter, I added a flag that signals when ahead reading is desired.

Binned and unbinned analysis mode is now automatically detected from the input file type. The method parameter has been removed, and a infile parameter has been introduced instead of the old evfile and cntfile parameters.

…for observation access