CdmRemote streaming

• CdmRemote: A remote CDM dataset (extending NetcdfFile), using cdmremote protocol to communicate
• NcStream: encoding and decoding the protobuf messages
• ncStream.proto: defines the protobuf messages
• NcStreamProto: generated by probuf compiler
• NcStreamReader: Read an ncStream InputStream into a NetcdfFile (used by CdmRemote)
• NcStreamWriter: Write a NetcdfFile to an OutputStream using ncstream protocol
• NcStreamWriterChannel: Write a NetcdfFile to an WritableByteChannel using ncstream protocol
• NcStreamIosp: IOSP to read an ncStream that has been written to a file