Veronika Vodeb / ctools

…TE-END, TIME-OBS and TIME-END

…cripts now from csobservation instead of cslikelihood since they do not use proper optimizers.

# Conflicts:
#	src/Makefile.am

The void constructors from ctools base classes are never used, tools are always constructed with a name and version number.

The ctobservation::first_unbinned_observation() and ctobservation::next_unbinned_observation() methods implement an unbinned CTA observation iterator. Using this iterator avoids code duplication and generates a uniform interface for tools to loop over CTA events lists.