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Bborie Park authored
Adds coverage table version of ST_Quantile and ST_ApproxQuantile. Function implemented using the algorithm discussed in A One-Pass Space-Efficient Algorithm for Finding Quantiles (1995) by Rakesh Agrawal, Arun Swami in Proc. 7th Intl. Conf. Management of Data (COMAD-95) http://www.almaden.ibm.com/cs/projects/iis/hdb/Publications/papers/comad95.pdf Also refactored the regression test for rt_histogram due to unnecessary columns in output git-svn-id: http://svn.osgeo.org/postgis/trunk@7765 b70326c6-7e19-0410-871a-916f4a2858ee
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