Add Pass 7 response files.
print() method ommits printing if reduced chattiness is SILENT.
Signal that Pass 7 response files have been added.
Load map cube in GModelSpatialDiffuseCube only when needed (#1143).

The map cube is now only loaded when its values should be accessed.
Add IRF index file to Fermi/LAT caldb
Add default "EBOUNDS" argument to Python constructor.
Enhance print() methods.
Implement save() and write() methods.
Add clone constructor for type casting.
Correct typos
Add std:: to pow() and sqrt() functions.
Add documentation.
Set PSF attribute before reading PSF information.

The PSF attribute FRONT/BACK has to be set before reading the scaling parameters as they depend which parameters are read. Before, the attribute has been set after reading the scaling parameters, which led to an application of the front scaling factors to the back response (see issues #603 and #1004).
Remove theta limitation to 70 degrees.
Adapt test reference results to corrected PSF handling.
Add information about Fermi/LAT PSF bug correction.
Merge branch '00-08-02' into integration