RFR: 7131: Uitests failing on Windows

[Marcus Hirt]

Fixed various problems, most related to the timestamp patch (#201).

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Commit messages:
 - Fixing formatting
 - Fixing core
 - Fixing various problems

Changes: https://git.openjdk.java.net/jmc/pull/218/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=218&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7131
  Stats: 3734 lines in 14 files changed: 479 ins; 0 del; 3255 mod
  Patch: https://git.openjdk.java.net/jmc/pull/218.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/218/head:pull/218

PR: https://git.openjdk.java.net/jmc/pull/218