[Rev 01] RFR: 5721: Reintroduce the Percentage column

[Dmitry Popov]

> This patch addresses [JMC-5721](https://bugs.openjdk.java.net/browse/JMC-5721): Reintroduce the Percentage column.
> 
> 1. StacktraceView has been amended to display Percentage column as well it displays stack trace and count ones. Percentage format is #.## (up-to 2 decimal points), it will also arbitrarily round the number.
> 2. Tool tip with frame fraction and sibling groups info has been moved from Count column to Percentage.
> 3. Currently Background drawer decorates Percentage column instead of Count.

Previous commits in this pull request have been removed, probably due to a force push. The incremental views will show differences compared to the previous content of the PR.

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Added commits:
 - 565529bb: JMC-5721 :: StacktraceView :: Reintroduce the Percentage column

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/12/files
  - new: https://git.openjdk.java.net/jmc/pull/12/files/b3ad0225..565529bb

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/12/webrev.01
 - incr: https://webrevs.openjdk.java.net/jmc/12/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/12.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/12/head:pull/12

PR: https://git.openjdk.java.net/jmc/pull/12