www update
Added radial background subtraciton option (surprisingly effective in some cases - and fast)
Added FEEspectrum in-line photon energy spectrometer
Small updates and fixes
IDL8.2 compatibility: Fixed annoying bug in the way IDL handled headers in read_csv() function (and undocumented side-effect of something)
End of shift 3 commits
Merge branch 'testing' into developer

Conflicts:
	source/cheetah_ana_pkg/src/cheetah_ana_mod.cpp