added descriptions for chunks. Inline chunks now have range and chunkRange properties. added debugDescription to RmdDocument.
added descriptions for chunks. Inline chunks now have range and chunkRange properties. added debugDescription to RmdDocument.

mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient