Andreas Specovius / ctools

…. 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.

# Conflicts:
#	doc/source/users/tutorials/notebooks.rst

This ensures the SED fits files are consistent with the current suggested data format

This frees other nodes when computing log-likelihood profiles