PROJ/data/tests/test_hgrid_big_endian.gsb, branch 7.1.0

PROJ/data/tests/test_hgrid_big_endian.gsb, branch 7.1.0 Forked from https://github.com/OSGeo/PROJ Fix wrong byte-swapping for NTv2 grids affecting master after RFC4 work (fixes #1938) 2020-02-20T08:57:45+00:00 Even Rouault even.rouault@spatialys.com 2020-02-19T21:14:15+00:00 86530f3146ec091c26652e60067088dc3e067fae And add testing of both little-endian and big-endian NTv2 files

And add testing of both little-endian and big-endian NTv2 files