Rolf Buehler / gammalib

…n writing the model into an XML file.

# Conflicts:
#	ChangeLog
#	NEWS
#	inst/cta/src/GCTAEventList.cpp

…GModelSpatialComposite.

The use of objects instead of pointers to object is saver and generally avoids having memory leaks.

Updated 'GModelTemporalPhaseCurve' to allow creating from XML format with an empty file attribute

…at are not covered by the RoI.

Removed all the deprecated code fragments from previous MC generation method.

'update_mc_cache()' now initializes an object of type 'GModelSpectralBrokenPlaw' used in MC generation.
Removed the entire batch of code which generates from a broken power law and replaced with generation of energies from the GModelSpectralBrokenPlaw::mc() method.

Added gradient formulae.
Added helpful notes.

Previously neglecting the appropriate handling in the CDF computation of the different indices above and below the break energy.
Now appropriately handles the case where (Emax < Ebreak) and (Emin > Ebreak).

Both methods for specifying the parameters of a "SmoothBrokenPowerLaw" model in an XML file are now supported.
Updated the test to reflect the actual way a spectral model is constructed in GammaLib.
The method still has some issues when generating the monte carlo. This is being worked on.

Added file "GModelSpectralSmoothBrokenPlaw.i" for python wrappers.
Added file "model_point_smoothbplaw.xml" for testing the construction of the class from xml file.
Updated "test_GModel.cpp" to include test of the 'GModelSpectralSmoothBrokenPlaw' class.
Some work is still needed to ensure the test passes when running 'make check'.

Implemented special handling in the MC event generation for when either (or both) the indices are -1.
Removed unnecessary vectors used for MC event generation.