Fixing Boundary discontinuity (by Q. Remy)

[carmeloevoli]

By the way I remember that there were discontinuities in the maps produced by hermes,
I think that is due to the rings boundaries definition :

hermes/src/neutralgas/RingModel.cpp

Line 78 in 07f26bd

auto highBoundary = (i < 11) ? boundariesHI.at(i + 1) : boundariesHI.at(i) + 1_kpc;

in my code I changed it as
auto highBoundary = (i < 11) ? boundariesHI.at(i + 1) + 0.3_kpc : boundariesHI.at(i) + 1_kpc;