Add kriging interpolation page (CONNECTIONTYPE kriging)

Document the kriging CONNECTIONTYPE: the localized NNGP method and its two
output bands (predictive mean and standard deviation), the PROCESSING reference,
and a self-contained, reproducible worked example. The example ships
downloadable files (the complete mapfile, two sampling networks, city points and
a simplified coastline) that render standalone with no external dependencies,
comparing IDW, the kriging mean and the kriging standard deviation for a dense
and a clustered sampling network.

Author: hermes.herrera

en/images/kriging-clustered.png

@@ -16,6 +16,7 @@
    idw
    imagemaps
    kerneldensity
+   kriging
    ogr_output
    pdf
    svg

en/images/kriging-dense.png

@@ -0,0 +1,7 @@
+wkt,city,annual_mm,elevation_m,weight,label
+POINT(174.76 -36.85),Auckland,1169,35,39,Auckland 1169 mm
+POINT(174.78 -41.29),Wellington,763,3,25,Wellington 763 mm
+POINT(173.28 -41.27),Nelson,1181,4,39,Nelson 1181 mm
+POINT(171.21 -42.45),Greymouth,2833,6,94,Greymouth 2833 mm
+POINT(172.64 -43.53),Christchurch,531,11,18,Christchurch 531 mm
+POINT(168.66 -45.03),Queenstown,1496,318,50,Queenstown 1496 mm

en/output/index.txt

@@ -0,0 +1,64 @@
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en/output/kriging-example/cities_major.csv

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