Added North backscattering banks. refs #8796

Added as individual neutronic pixels
Used BSS_23741_event.nxs for values
Updated Analysing Energy. refs #8796

Updating by using the same constant for converting from
wavelength to energy transfer that TranslationService uses.

Namely:
   analyser_energy = 81.8042051/analyser_wavelength**2
Merge branch 'feature/8796_basis_idf' into develop