Use --quiet instead of --verbose command line option.
Add support for GDAL 2.

GDAL version 2 has some API breaking changes. See
http://trac.osgeo.org/gdal/wiki/rfc46_gdal_ogr_unification .
The main change is that OGRDataSources and GDALDatasets have been unified. This
lead to a whole slew of renamings throughout.
Rename ogrcpp to gdalcpp.