WKT1 importer: do case insensitive comparison for axis direction #1509
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Fixes OSGeo/gdal#1623
http://portal.opengeospatial.org/files/?artifact_id=999 is not explicit if
string comparisons should be case sensitive or not, but WKT2 allows for case
differences in keyword and enumerated value, so follow this relaxed interpretation
for WKT1 as well.