Changed the isReadWrite parameter to createVolumeDataPageAccessor to be an AccessModeEnum with an AccessMode_Create option so we can handle ProduceStatus better (passing this accessmode changes the produceStatus of the target layer to ProduceStatus_Normal).

Update JSON handling to conform to new version of OpenVDS specification. Rename everywhere 'Lod' to LOD since it is an abbreviation and not a word.

stubbed out implementation