Johan Bregeon / ctools

…lementing missing information from user parameters.

…ag in the execute() method.

Although the get_obs() method was put back, ctmodel used the dummy cube (which consisted of a single pixel) instead of a cube defined from the input parameters. This was due to an internal change of the logic, that now has been corrected for.

Added ctool::require_inobs_nocube() method that throws an exception if a counts cube has been specified as inobs parameter. This method is then used by ctbin, ctexpcube, ctpsfcube and ctbkgcube.

Conflicts:
	ChangeLog
	NEWS
	src/ctbkgcube/ctbkgcube.cpp
	test/test_ctools.sh

…in case that those are not provided in the event list.

…response information in the XML observation definition file (when needed).

…l be queried in case that the observation contains a counts cube and if these parameters to indeed exist in the parameter file.

…(see #1360 for details).

…)-function of individual ctools

…s. This method is useful for debugging the memory usage of 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.

…ss for CTA observation response setting.