erp5_web_renderjs_ui: html5_select: event option for notifyChange added. needs for determine event.type on parent gadget

i need it because use span for displaying icons in json form

This is needed when running livetests in a runUnitTest instance, in the
following scenario:
 - `runUnitTest --save test_bt:testXXX`
 - `runUnitTest --save --load`
 - run the live test from the browser

because livetest way of processing activities is to unsubscribe at the
beginning of the test and subscribe at the end to have control of
activities when running .tic, if ProcessingNodeTestCase also process the
activities automatically, they interfere and test often fail with errors like:

```
File "ERP5Type/tests/ProcessingNodeTestCase.py", line 249, in tic
  raise RuntimeError(error_message)
RuntimeError: tic is looping forever. These messages are pending: [('/erp5/portal_components/test.erp5.testSupportRequest', 'immediateReindexObject', 1, 0), ('/erp5/support_request_module/2617', 'immediateReindexObject', -1, 0)]
```

/reviewed-on nexedi/erp5!779

This step just checks that multi relation field listbox shows a list of
related document and that clicking on any item of the list leads to the
related document.
The order of related documents in the list has always been unspecified,
but the first one was always 1 until recently.
Because this test does not really care which one of the two related
document was clicked, just assert that it's a document from foo_module.

/reviewed-on nexedi/erp5!774

89115b88 is great, but with "testFunctionalAnonymousSelection" the
result HTML is more than 40Mo.

/reviewed-on nexedi/erp5!772

This will insure that the URL created for diff by `Base_redirect` will have the paramters
`your_first_path` and `your_second_path` in it, thus making it unique and hence
sharable. Before, we only used to have the name of selection in the URL which
returned different result for different users.

also use '>' instead of image