this panel shows all logged elasticsearch queries and allows to execute
them to see the results.

- allows to have dynamic definition of attributes depended on the
  instance
- there was no real need for it to be static. Places that used it static
  have been refactored.

fixes #1318

issue #1317

far better than depending on fat guzzle

fixes #1319

Model::attributes() has been made static

as suggested in issue #1316

fixes #1316

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