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

[Sergey Ponomarev]

On Thu, 8 Oct 2020 10:03:37 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Sergey Ponomarev has refreshed the contents of this pull request, and previous commits have been removed. The
>> incremental views will show differences compared to the previous content of the PR. The pull request contains one new
>> commit since the last revision:
>>   README.md: Add related projects
>>   
>>   Signed-off-by: Sergey Ponomarev <stokito at gmail.com>
>
> 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)

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