OSGeo / proj.4 / 1495

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Make the 4D API fully 4D (#788)

Make 4D API fully 4D:

Remove PJ_XY, PJ_LP, PJ_XYZ, PJ_LPZ etc. from the API surface and
make all formal parameters of the API fully 4D PJ_COORD.

This operation primarily influences the proj_XXX_dist functions,
which mostly work by calling Charles Karney's geodesic
subsystem, keeping the distance, and throwing away the start and
end azimuths for the geodesic computed.

Also a PJ_GEOD(esic) persona is introduced for the PJ_COORD type.
The proj_geod function returns a PJ_GEOD, representing the geodesic
between the points represented by its PJ_COORD arguments.

Finally, the proj_factors functions had its lp argument changed
from PJ_LP to PJ_COORD.

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