RFR: Cleanups: README typos and links, .gitignore, leftover JDK migrations, column widths [v2]

[Aleksey Shipilev]

On Thu, 8 Oct 2020 10:28:44 GMT, Sergey Ponomarev <github.com+415502+stokito at openjdk.org> wrote:

>> README.md line 166:
>> 
>>> 164:
>>> 165: * [IntelliJ IDEA JOL Plugin](https://github.com/stokito/IdeaJol) can estimate object size and has an inspection to
>>> find heavy classes 166: * Heap dump `*.hprof` files analysers:
>> 
>> Heap dump decoding is very experimental in JOL, and hardly a target for current development. So listing heap dump
>> analyzers looks excessive.
>
> Agree, still this is something that can be used to solve memory issues. For newcomers this may be time saver to see
> such related projects. If you think that this is excessive I'll remove the commit or left IdeaJOL only (if you don't
> mind)

Yeah, mention IdeaJOL, don't mention hprof analyzers.

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PR: https://git.openjdk.java.net/jol/pull/7