RFC 46: GDAL/OGR unification

From: Even Rouault <even.rouault@mines-paris.org>

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@27384 f0d54148-0727-0410-94bb-9a71ac55c965
Update version number to 2.0.0

From: Even Rouault <even.rouault@mines-paris.org>

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@27385 f0d54148-0727-0410-94bb-9a71ac55c965