RFR: 545: Support additional forms of labels for the /cc command

[Robin Westberg]

Hi all,

Please review this small change that makes the `/cc` command a bit more intuitive.

Best regards,
Robin

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Commit messages:
 - Add support for ignoring certain label suffixes

Changes: https://git.openjdk.java.net/skara/pull/766/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=766&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-545
  Stats: 59 lines in 2 files changed: 57 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/766.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/766/head:pull/766

PR: https://git.openjdk.java.net/skara/pull/766