- update to 1.6.0:
* Add support for OGC GeoTIFF 1.1
* Expose GTIFGetPCSInfoEx(), GTIFGetProjTRFInfoEx(), GTIFGetGCSInfoEx(), GTIFGetDatumInfoEx(), GTIFGetEllipsoidInfoEx(), GTIFGetPMInfoEx(), GTIFGetUOMLengthInfoEx() and GTIFGetUOMAngleInfoEx() so that users can specify their own PROJ context
* Add GTIFKeyGetASCII(), GTIFKeyGetSHORT() and GTIFKeyGetDOUBLE() as safer variants of GTIFKeyGet() with type checking
* autotools build: enable build in a separate tree from source (#37) (fixes #28)
* Use pkg-config for libtiff detection
* GTIFDecToDMS(): fix rounding issue (refs #16)
* geo_names.c: Silence warning in GetNameFromDatabase
* cpl_serv.h: add parenthesis in macro definitions
* Fix spelling errors
* geo_normalize.c: set UOMLength from GeogLinearUnits (for geocentic CRS) (GDAL #1595)
* testlistgeo: remove hardcoded path in test output (fixes https://github.com/OSGeo/libgeotiff/issues/16#issuecomment-502267406)
* Adapt test script for PROJ 6.2 EPSG database (fixes #22)
* Use unix EOL for cmake related files (fixes #14)
* configure.ac: drop dead code
* geo_normalize.c: avoid look up of user-defined geokeys that cause PROJ warnings (fixes GDAL #2321)
* listgeo: fix corner coordinates for images with RasterPixelIsPoint (#36)