Add GridPoint definitions to KnownMetadata
- Fix generated Python MetadataKey API so it doesn't have the suppressed constructor with char*s.
- Update Python API with removal of IVolumeDataAccessor::IndexOutOfRangeException and IVolumeDataAccessor::ReadErrorException.
- Add GridPoint definitions to KnownMetadata.h and update Python API.
Edited by Morten Ofstad