RFR: CODETOOLS-7903501: JOL: Reformat heapdump-estimates output

[Aleksey Shipilev]

Heapdump-estimates is a very useful tool to select a proper JVM mode, based on heap dump of live objects. We can make it much more human-readable.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jol/pull/42/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=42&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903501
  Stats: 382 lines in 3 files changed: 364 ins; 1 del; 17 mod
  Patch: https://git.openjdk.org/jol/pull/42.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/42/head:pull/42

PR: https://git.openjdk.org/jol/pull/42