RFR: 708: Email version of UI file comment used the wrong version of the file

[Robin Westberg]

When a comment is made on the "previous" version of a change, the line number may not match the reported hash. This should improve things. Tested manually on https://github.com/openjdk/jdk/pull/2843/files .

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Commit messages:
 - Improve GitHub review comment line number parsing

Changes: https://git.openjdk.java.net/skara/pull/1044/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1044&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-708
  Stats: 20 lines in 1 file changed: 8 ins; 1 del; 11 mod
  Patch: https://git.openjdk.java.net/skara/pull/1044.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1044/head:pull/1044

PR: https://git.openjdk.java.net/skara/pull/1044