RFR: 6832: Should allow plotting line charts for all quantities

[Oskar Jung]

6832: Should allow plotting line charts for all quantities

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Commit messages:
 - 6832: Allow LineCharts in more places
 - Fix not being able to run core tests from eclipse
 - Remove trailing whitespace and add new line at end of file
 - Add inline code listing

Changes: https://git.openjdk.java.net/jmc/pull/255/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=255&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6832
  Stats: 45 lines in 9 files changed: 5 ins; 17 del; 23 mod
  Patch: https://git.openjdk.java.net/jmc/pull/255.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/255/head:pull/255

PR: https://git.openjdk.java.net/jmc/pull/255