make more parallels of spatial aggregate functions to normal functions
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VladimirAlexiev commented
https://opengeospatial.github.io/ogc-geosparql/geosparql11/spec.html#_spatial_aggregate_functions makes two parallels:
- geof:aggUnion - geof:union
- geof:aggConvexHull - geof:convexHull
It should make 4 more parallels:
- geof:aggBoundingBox - geof:envelope
- geof:aggBoundingCircle - geof:boundingCircle
- geof:aggCentroid - geof:centroid
- geof:aggConcaveHull - geof:concaveHull
Following the existing text, all of them should look like this:
geof:aggX: NOTE: This function is similar in name to geof:X used to calculate the X of just one geometry.
This complements #482 by making it clear why there are pairs of functions.