RFR: 6691: The root of the flame graph could be improved

[Miroslav Wengner]

https://bugs.openjdk.java.net/browse/JMC-6691

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Commit messages:
 - Merge branch 'master' of https://github.com/openjdk/jmc into feature/6691_The_root_of_the_flame_graph_could_be_improved
 - 6691: messages update
 - 6691: eventype aggregation, cleanup
 - 6691: items count update
 - 6691: rootNode flameview table, css
 - 6691: update
 - 6691: tooltip, improvements
 - Merge branch 'master' of https://github.com/openjdk/jmc into feature/6691_The_root_of_the_flame_graph_could_be_improved
 - Merge branch 'master' of https://github.com/openjdk/jmc into feature/6691_The_root_of_the_flame_graph_could_be_improved
 - Merge branch 'master' of https://github.com/openjdk/jmc into feature/6691_The_root_of_the_flame_graph_could_be_improved
 - 6691: partial commit
 - Merge branch 'master' of https://github.com/openjdk/jmc into feature/6691_The_root_of_the_flame_graph_could_be_improved
 - 6691: partial commit

Changes: https://git.openjdk.java.net/jmc/pull/67/files
 Webrev: https://webrevs.openjdk.java.net/jmc/67/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6691
  Stats: 291 lines in 9 files changed: 252 ins; 9 del; 30 mod
  Patch: https://git.openjdk.java.net/jmc/pull/67.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/67/head:pull/67

PR: https://git.openjdk.java.net/jmc/pull/67