bugfix: restore / view deleted file
  * before restore / view a delted file the actual fh was initialized
  * but the file was deleted - no actual fh was found and a error
    was thrown
use LineBasedDeltas for file patch
  * go-diff has sometimes garbage in the char-based-diffs
    (needs research)
  * line-based has more context -> better verify file phase
update README for v0.0.6