Veronika Vodeb / ctools

Removed a couple of unnecessary computations and added comments to the code.

Implemented a fix for the csresmap 'SIGNIFICANCE' algorithm which was causing it to take the square root of a negative number.

…pute PSF and energy dispersion IRFs (#2135)

The working log file pointer was not forwarded to ctobssim::set_mc_id_names() and consequently the standard log file pointer was used, which occasionally lead to the exception during the Python unit test. Now the log file pointer is forwarded properly.

…kymap and method that returns model container

…servation container through the obs() method.

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