Flint: Also supports scatter plot histo2d without hint info
Closes #2346 (closed)
This MR improve and simplify the way to describe a scatter with an histogram 2d
- Allow to display histogram 2d also with
axis points
(and not onlyaxis points hint
)- On ID15 the axis point is known, but the scatter is not regular (cause the first point can be anywhere in each row (that's an angle -> modulo 360))
- Add half pixel around the histogram2d
Related to #2336 (closed) (cause they can now use solid rendering, instead of point based rendering, which uses less memory)
ID15 is already hotfixed.