RFR: 7903589: JOL: Rework and amend CLI tools [v3]

[Aleksey Shipilev]

> CLI tools need a few touchups. Heapdump utilities, notably, need more work.

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Update more README

-------------

Changes:
  - all: https://git.openjdk.org/jol/pull/55/files
  - new: https://git.openjdk.org/jol/pull/55/files/8649f114..a37e94ea

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jol&pr=55&range=02
 - incr: https://webrevs.openjdk.org/?repo=jol&pr=55&range=01-02

  Stats: 102 lines in 2 files changed: 8 ins; 3 del; 91 mod
  Patch: https://git.openjdk.org/jol/pull/55.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/55/head:pull/55

PR: https://git.openjdk.org/jol/pull/55