Store core reconstruction results in lat/lon/alt instead of x,y (enu)

[153957]

Using lat/lon/alt frees you from needing to know the reference lla of the cluster used for the reconstruction.
Also makes it easier to determine the ra,dec of a reconstructed shower.

[153957]

After some thinking I think it would be easier to simply store the reference lla in an attribute of the reconstructions table.

The core reconstruction should always return the core position at z=0 in the ENU system for the given reference lla.

[153957]

Likewise for direction reconstructions. The zenith and azimuth are also local coordinates, so a reference lla (and core position) is also required for zenith and azimuth. This can be important when reconstructing coincidences for the Bristol/Aarhus cluster while the cluster reference lla is in Amsterdam.

Note that it will result in strange core positions in such cases.. I suppose that coincidence reconstructions should be done per cluster..