Veronika Vodeb / ctools

# Conflicts:
#	ChangeLog
#	NEWS

# Conflicts:
#	ChangeLog
#	NEWS
#	README.md
#	configure.ac
#	ctools.pc.in
#	doc/Doxyfile
#	doc/source/admin/release_history/1.3.1.rst
#	doc/source/conf.py
#	sonar-project.properties
#	src/ctmodel/ctmodel.cpp

Optimized computation intensive parts of ctmodel to reduce computation time.
Implemented openmp parallelization of ctmodel to reduce computation time.
Updated information logging (#2147)

Updated writing information to log file in order to prevent messy log file messages. This doesnt appear to impact the computation time.
Integrate code without modification of GammaLib (#2147)
Implement efficient model computation (#2147)
Update change log (#2147)

We now have an explicit release history hence the links to the change logs are no longer needed

# Conflicts:
#	ChangeLog
#	README.md
#	configure.ac
#	ctools.pc.in
#	doc/Doxyfile
#	doc/source/conf.py
#	pyext/Makefile.am
#	sonar-project.properties
#	test/test_examples.py.in
#	test/test_python_cscripts.py
#	test/test_python_ctools.py

# Conflicts:
#	doc/source/users/tutorials/1dc/first_fitting.rst
#	doc/source/users/tutorials/1dc/first_spectrum.png