GDA-5899 [Cherry pick from master] upgrade TwoGaussianEdges to use new
scisoft plotting as the old one has stopped working for some cases
GDASCRIPTS: Fix TwoGaussianEdges (will have been fixed on gda master
separately--choose master)
Merge branch '8.34' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.34