Update to 2.0.3

Upstream changes for 2.0.0 follow.  (2.0.[123] are bugfixes)

* New GDAL drivers:
    - BPG: read-only driver for Better Portable Graphics format (experimental, no build support)
    - GPKG: read/write/update capabilities in the unified raster/vector driver
    - KEA: read/write driver for KEA format
    - PLMosaic: read-only driver for Planet Labs Mosaics API
    - ROI_PAC: read/write driver for image formats of JPL's ROI_PAC project (#5776)
    - VICAR: read-only driver for VICAR format
* New OGR drivers:
    - Cloudant: read/write driver for Cloudant service
    - CSW: read-only driver for OGC CSW (Catalog Service for the Web) protocol
    - JML: read/write driver for OpenJUMP .jml format
    - PLScenes: read-only driver for Planet Labs Scenes API
    - Selaphin: read/write driver for the Selaphin/Seraphin format (#5442)
* Significantly improved drivers: CSV, GPKG, GTiff, JP2OpenJPEG, MapInfo file, PG, SQLite
* RFC 31: OGR 64bit Integer Fields and FIDs (trac.osgeo.org/gdal/wiki/rfc31_ogr_64)
  In OGR core, OGR SQL, Shapefile, PG, PGDump, GeoJSON, CSV, GPKG, SQLite, MySQL,
  OCI, MEM, VRT, JML, GML, WFS, CartoDB, XLSX, ODS, MSSQLSpatial, OSM, LIBKML, MITAB
* RFC 46: GDAL/OGR unification ( http://trac.osgeo.org/gdal/wiki/rfc46_gdal_ogr_unification)
    - GDAL and OGR PDF drivers are unified into a single one
    - GDAL and OGR PCIDSK drivers are unified into a single one
* RFC 49: Add support for curve geometries (http://trac.osgeo.org/gdal/wiki/rfc49_curve_geometries)
  In OGR core, and GML, NAS, PostgreSQL, PGDUMP, GPKG, SQLite, VFK, VRT, Interlis drivers
* RFC 50: Add support for OGR field subtypes (http://trac.osgeo.org/gdal/wiki/rfc50_ogr_field_subtype)
  In OGR core, OGR SQL, swig bindings, CSV, FileGDB, GeoJSON, GML, GPKG, OpenFileGDB, PG, PGDump, SQLite, VRT
* RFC 51: RasterIO() improvements : resampling and progress callback (http://trac.osgeo.org/gdal/wiki/rfc51_rasterio_resampling_progress)
* RFC 52: Stricter SQL quoting (http://trac.osgeo.org/gdal/wiki/rfc52_strict_sql_quoting)
* RFC 53: OGR not-null constraints and default values (http://trac.osgeo.org/gdal/wiki/rfc53_ogr_notnull_default)
  In OGR core, OGR SQL, PG, PGDump, CartoDB, GPKG, SQLite, MySQL, OCI, VRT, GML, WFS, FileGDB, OpenFileGDB and MSSQLSpatial
* RFC 54: Dataset transactions (https://trac.osgeo.org/gdal/wiki/rfc54_dataset_transactions)
  In PG, GPKG, SQLite, FileGDB and MSSQLSpatial
* RFC 55: refined SetFeature() and DeleteFeature() semantics.
  In GPKG, Shape, MySQL, OCI, SQLite, FileGDB, PG, CartoDB, MITAB and MSSQL
* RFC 56: OFTTime/OFTDateTime millisecond accuracy ( https://trac.osgeo.org/gdal/wiki/rfc56_millisecond_precision )
* RFC 57: 64bit histogram bucket count ( https://trac.osgeo.org/gdal/wiki/rfc57_histogram_64bit_count )
* Upgrade to EPSG v8.5 database
* Fix locale related issues when formatting or reading floating point numbers (#5731)

(gdt)