Fileset instability when multiple files have the same contents

[micha]

The fileset currently stores blobs by content hash only. This can cause false positives for things that monitor last modification times because the actual files in the fileset are only hard links to files in the blob store. The fileset mechanism should intelligently copy files when necessary to support multiple files with the same contents in the blob store but with different mtimes.

[micha]

This doesn't seem to be a problem. Closing this ticket for now.