Flattening of geometries to 2D since IWkb.ImportFromWkb fails when elevation is present.

Not a definitive fix, but should do the trick for now.
Merge branch 'fixes'
Add support for adding multiple layers in Add data Dialog.
Add bin and obj folder to .gitignore
enable TRACE and DEBUG flag during debug builds
Do mapping of subfields exactly as specified in documentation
Add workaround for UTF16 unicode problem with Swig bindings.
Disable Z-support until we have written a workaround for bug in ImportFromWKB
Copy values to row and ignore mapping since AO doc seems to be wrong about it.
Add Button to figure out which drivers have been picked up by GDAL/OGR.
This should really be separated into a separate dialog, but will do for
now.
Update README with new build information
Make sure I said it is beta - not the final version
Merge remote-tracking branch 'upstream/master'