Add test data for diffuse emission analysis in the Crab region.
Updated link for feature request submission.
Add pixel value set operator=.

The pixel value set operator will assign the same value to all sky map pixels, i.e.

map = 1.0;

will set all map pixels to 1.0.
Add GCTASourceCubeDiffuse class and start implementing the GCTAResponseCube::irf_diffuse method.

The actual implementation of the IRF computation in GCTAResponseCube::irf_diffuse is still missing, yet we have the structure in place that allows not handling of the diffuse response cubes. We essentially need now a method that computes the diffuse IRF for a given event.
Implemented diffuse source cube PSF integration.

Now, the diffuse source cube class is fully functional. Some tests were done to adjust the integration precision.
add GCTABackground3D::table(GCTAResponseTable)
Implement stacked cube analysis of extended sources.

This is still pretty slow code, will now dive into this to better understand what the bottle necks are.
Remove GCTASourceCubeRadial
Refactor PSF integration for stacked cube analysis.
Update Doxygen documentatuion of romb() method.
Implement adaptive Simpson's rule integrator.

A new integrator has been implemented together with a unit test.
Update Doxygen documentation.
Implement Gauss-Kronrod quadrature in GIntegral class.
Set also relative error if information is available.
Romberg integrator now also sets relative and absolute error.
Add shell and disk model test data.
Implement and optimize stacked cube response computation for radial models.
Update to correctly set deadc and livetime.
Add elliptical disk model test data.
Correct deadtime corrections and recompute exposure and PSF cubes after taking into account 5% of deadtime.