RFR: 1008: GitCombinedDiffParser does not handle un-modified copied files

[Erik Helin]

Hi all,

please review this patch that makes the `GitCombinedDiffParser` handle not only renames with modifications (with regards to all parents), but also copies without modifications (with regards to all parents).

Thanks,
Erik

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Commit messages:
 - skara-1008

Changes: https://git.openjdk.java.net/skara/pull/1143/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1143&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1008
  Stats: 6 lines in 1 file changed: 2 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/1143.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1143/head:pull/1143

PR: https://git.openjdk.java.net/skara/pull/1143