Proposed third name for bundle: content hash

[kyocum]

Provide a third name to allow users and the system to identify "same data."

For each Frame in the bundle HyperFrame, hash key and contents. If it is a link frame, then hash the files as well.

Further research needed to determine what "same" means. That is, does a content hash of a link frame also hash the file name? Does the content hash include the frame's (columns) name?