Fix h_max definition

[kosack]

Fixes #2395

• In HillasReconstructor, Define h_max as the vertical height above sea level (including the observatory height) of the shower-max point, and not the distance from the array which was there before.
• In HillasIntersection, use the correct observatory height value

When #2402 is merged, I will remove the checks for missing reference_location

[maxnoe]

Docs failure is fixed in main, please rebase

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[kosack]

I think I will still add "slant" versions of the two quantities to the data model:

• shower_distance: the distance from the impact point of the shower projected to sea-level to the shower-max point
• shower_slant_depth: the line integral over the atmosphere from infinity to the shower-max point along the shower axis

The question now is if we keep h_max and x_max or rename them shower_height and shower_depth (breaking data model change, but as clearly nobody has used these up to now, maybe it's not a worry)

[maxnoe]

Something went wrong here with the merge/rebase?

[kosack]

Something went wrong here with the merge/rebase?

not sure what it was, but I rebased again and did a force-with-lease, and seems ok now