warn if a file with damaged chunks is extracted, fixes #1299
warn if a file with damaged chunks is extracted, fixes #1299

before 1.0.4/1.0.5 we had no means to tell if a file has been "repaired" with all-zero
chunks, but now we can see it if chunks_healthy key is present.

edgimar/borg,edgimar/borg,edgewood/borg,edgewood/borg,RonnyPfannschmidt/borg,raxenak/borg,raxenak/borg,raxenak/borg,edgewood/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgimar/borg,raxenak/borg,edgimar/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgewood/borg