- Allow to continue to edit a form while saving is on going
- Reset fields on form view update (like by clicking on the active tab from the panel)
- Fix rendering an input like gadget with the same value as rendered before causes the
  gadget to be not updated even if the field has been manually edited.

/bug #20190204-39AF19
https://nexedijs.erp5.net/#/bug_module/20190204-39AF19

/reviewed-on nexedi/erp5!861

[erp5_web_renderjs_ui] Revert partially

It seems the commit reimplement a kind of adhoc changeState

[erp5_hal_json_style] Rerender the form after a successfull edit

[erp5_web_renderjs_ui] For refresh if render is called from parent gadget.

In reality, it should be done by internally only using changeState, but that's another story

[erp5_web_renderjs_ui_test] Base_edit only trigger one ajax call

DATETIMEFIELDUPDATE clean some of romain's code

DATETIMEFIELDUPDATE add new test to check if header title is correctly updated

remove now meaningless test

use is_refresh in case of 400 error too

refresh header after saving

try toi keep the notification message

test: reuse macro

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