RFR: 6967: Add Percentage Column w.r.t 'Profiling Samples' in Thread table [v2]

[Guru Hb]

> Adding "Percentage" column in Thread table (JavaApplication View). which is helpful in knowing the ratio w.r.t "Profiling Samples"
> JMC 5.x had the Percentage Column in "Hot threads" tab.

Guru Hb has updated the pull request incrementally with one additional commit since the last revision:

  externalize Table column name and its description

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/260/files
  - new: https://git.openjdk.java.net/jmc/pull/260/files/2366040a..183e87a2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=260&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=260&range=00-01

  Stats: 6 lines in 3 files changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/260.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/260/head:pull/260

PR: https://git.openjdk.java.net/jmc/pull/260