RFR: 1201: Multiple command reply messages include 'HostUserDetails'

[Magnus Ihse Bursie]

Fixing this as the bug reporter suggested, by removing all explicit (broken or not) and duplicated constructions of "@" + username in the command replies, and adding a general @-mention in CommitCommands as well as PR Commands.

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Commit messages:
 - 1201: Multiple command reply messages include 'HostUserDetails'

Changes: https://git.openjdk.java.net/skara/pull/1231/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1231&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1201
  Stats: 26 lines in 5 files changed: 3 ins; 4 del; 19 mod
  Patch: https://git.openjdk.java.net/skara/pull/1231.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1231/head:pull/1231

PR: https://git.openjdk.java.net/skara/pull/1231