RFR: 734: ML->PR: full names containing non-ascii chars are displayed incorrectly.

[Robin Westberg]

Ensure that the MIME 'Q' text decoder properly handles multibyte values.

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Commit messages:
 - Properly support multi-byte encoding

Changes: https://git.openjdk.java.net/skara/pull/1090/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1090&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-734
  Stats: 13 lines in 2 files changed: 6 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/skara/pull/1090.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1090/head:pull/1090

PR: https://git.openjdk.java.net/skara/pull/1090