RFR: Improve review comment threading and quoting

[Robin Westberg]

Hi all,

Please review this change that improves how review comments are threaded and quoted when bridged to mailing lists.

Best regards,
Robin

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Commits:
 - 14444724: Improve review comment threading and quoting

Changes: https://git.openjdk.java.net/skara/pull/283/files
 Webrev: https://webrevs.openjdk.java.net/skara/283/webrev.00
  Stats: 1310 lines in 19 files changed: 643 ins; 423 del; 244 mod
  Patch: https://git.openjdk.java.net/skara/pull/283.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/283/head:pull/283

PR: https://git.openjdk.java.net/skara/pull/283