Many changes on explain.depesz.com

Some time ago Eugen Konkov mailed me that he'd like to have some changes on explain.depesz.com.

One of the changes was actual bug, but the rest were improvements to functionality.

I kinda didn't want to do it, but when I looked closer it appeared to me that there are some subtle bugs, and when I'll be fixing them, I can add some of the things Eugen requested:

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