Simon Bonnefoy / gammalib

The smoothing kernel covered before only two sectors, now all four sectors are covered. The smoothing now also works correctly in case that more than a single sky map is comprised in a GSkyMap object.

…d::save() methods to Python interface and avoid segfault in GObservations::likelihood::covariance() method for non-allocated curvature matrix

# Conflicts:
#	ChangeLog

…n writing the model into an XML file.