Johan Bregeon / ctools

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.

All likelihood ctools now derive from the ctlikelihood base class. This avoids code duplication and provides all likelihood tools with a uniform interface.

The pars() methods allow to assign or to retrieve all application parameters in a dictionary. Makes ctools a bit more "Pythonic".

To avoid code duplication in cscripts the support modules "modutils' and "ioutils" have been added. The obsolete functions cntmap() and modmap() have been removed from the "obsutils" module.

# Conflicts:
#	ChangeLog

The publish parameter has been added to the following tools:
- ctbin
- ctbkgcube
- ctcubemask
- ctexpcube
- ctmodel
- ctskymap
- cttsmap

# Conflicts:
#	ChangeLog
#	NEWS
#	README
#	test/test_cscripts.sh.in

# Conflicts:
#	ChangeLog
#	NEWS
#	README