Missing integrators for replacing integrate_legacy with integrate_ng

[kif]

For 1D integration :

• [X] IntegrationMethod(1d int, bbox split, histogram, cython)
• [X] IntegrationMethod(1d int, full split, histogram, cython)
• [X] Make integrate1d_ng the default integrator

For 2D integration, much work remains to be done a bit everywhere !

• [x] IntegrationMethod(2d int, no split, histogram, python): signal looks bad ?
• [x] IntegrationMethod(2d int, no split, csr, python)
• [x] IntegrationMethod(2d int, full split, csr, python)
• [x] IntegrationMethod(2d int, bbox split, csr, python)
• [x] IntegrationMethod(2d int, no split, histogram, cython): axis swaped ?
• [x] IntegrationMethod(2d int, full split, histogram, cython)
• [x] IntegrationMethod(2d int, bbox split, histogram, cython)
• [x] IntegrationMethod(2d int, no split, lut, cython)
• [x] IntegrationMethod(2d int, full split, lut, cython)
• [x] IntegrationMethod(2d int, bbox split, lut, cython)
• [x] IntegrationMethod(2d int, no split, csr, cython)
• [x] IntegrationMethod(2d int, full split, csr, cython)
• [x] IntegrationMethod(2d int, bbox split, csr, cython)
• [x] #1617
• [ ] #1618
• [ ] #1619
• [x] IntegrationMethod(2d int, no split, lut, opencl)
• [x] IntegrationMethod(2d int, full split, lut, opencl)
• [x] IntegrationMethod(2d int, bbox split, lut, opencl)
• [x] IntegrationMethod(2d int, no split, csr, opencl)
• [x] IntegrationMethod(2d int, full split, csr, opencl)
• [x] IntegrationMethod(2d int, bbox split, csr, opencl)
• [x] Make integrate2d_ng the default integrator

[kif]

To be validated but the matrix is almost complete ...