Iftach Sadeh / ctools

in case `edisp=True`, only use it in practice once the flux calculation is near convergence

- add `_set_src_prefactor` function, which sets the test prefactor while checking that the limits are not violated
- add safety check as part of `_predict_flux`, to avoid division by zero
- add `_sim_evt_excess` function, which is used to increase the test source flux in case the optional conditions on the number of source counts are not met

A _set_source() method was introduced in cssens that deals with the setting of the test source direction independent of the code in the _set_obs() method, since that latter method is not necessarily called. The _set_obs() method now only deals with setting of the pointing direction of a single observation, in case that no observation definition XML file was specified on input.

…5_cssens_source_location

# Conflicts:
#	ChangeLog
#	NEWS
#	README.md
#	configure.ac
#	cscripts/csspec.py
#	doc/Doxyfile
#	doc/source/admin/download.rst
#	doc/source/admin/release_history/index.rst
#	doc/source/conf.py
#	doc/source/users/reference_manual/csspec.rst
#	sonar-project.properties

The "wait" statement assures that the output file is not exited before old child processes are finished. This provides better control over the proceedings of the TS computation.

The current script covers all 1DC tutorials.

…. As the necessary separation angle depends on the rotation angle but also on the rectangle extension (overlaps may easily occur) the computation is not so easy: I implemented a rough (slightly overestimating) algorithm which chooses the maximum opening angle between the corners of the rectangle with respect to the pointing position. Extended implementation of _reflected_regions() method to allow the placement of rectangular off regions, which is essentially finally placing a rectangle instead of a circle.

…ontaining the pointing (should be equal, but has greater flexibility for different (filled) region types)

…et_state and set_state methods.