Bug in logarithmic coord delta
@elena The seems to be a bug in dRadii(i) (which is suppose to be radii(i+1)-radii(i)) when we use logarithmic spacing.
Fix is trivial but requires so I do it through a merge request to ease rollback if necessary.
The problem is that we use: {rmin}*\log{({rmax}/{rmin})}*(\exp{((i+1)/{nr})} - \exp{(i/nr)})
which does not equal
{rmin}*\exp{(i+1)*\log{({rmax}/{rmin})}/{nr})} - {rmin}*\exp{(i)*\log{({rmax}/{rmin})}/{nr})}