EHdr: implements GetNoDataValue() instead of calling SetNoDataValue() in the opening code, so as to avoid to rely on PAM to return the nodata value (since the nodata primarily comes from the .hdr file and not PAM)

git-svn-id: https://svn.osgeo.org/gdal/trunk@25701 f0d54148-0727-0410-94bb-9a71ac55c965
OGR-VFK: major VFK driver update
         fix various bugs/issues
         add configuration options
         store geometry in DB (speed optimization)


git-svn-id: https://svn.osgeo.org/gdal/trunk@25702 f0d54148-0727-0410-94bb-9a71ac55c965
OGR-VFK: build VFK driver only when SQLite support is available
         remove --with-vfk switch


git-svn-id: https://svn.osgeo.org/gdal/trunk@25703 f0d54148-0727-0410-94bb-9a71ac55c965
OGR-VFK: skip invalid features for selected layers (when reading from DB)


git-svn-id: https://svn.osgeo.org/gdal/trunk@25704 f0d54148-0727-0410-94bb-9a71ac55c965
add a note to the gft driver page noting that gdal_auth.py is available after 1.10.0

git-svn-id: https://svn.osgeo.org/gdal/trunk@25705 f0d54148-0727-0410-94bb-9a71ac55c965
avoid making the edge/grid sampling arrays large for large images (#5020)

git-svn-id: https://svn.osgeo.org/gdal/trunk@25707 f0d54148-0727-0410-94bb-9a71ac55c965
remove swisstopo example that encourages violating the terms of use (#5022)

git-svn-id: https://svn.osgeo.org/gdal/trunk@25708 f0d54148-0727-0410-94bb-9a71ac55c965
try to recover from failure to allocate error context more gracefully (#4175)

git-svn-id: https://svn.osgeo.org/gdal/trunk@25710 f0d54148-0727-0410-94bb-9a71ac55c965