for compatibility with Base.checkProperty.

This introduce a `_getProperty` method that's not really part of public
API, but could be called to get a property without security check.
Because some classes were already using internally a _getProperty method
for a different meaning, these methods have been renamed.

This also re-enable parts of test_PropertySheetSecurityOnAccessors that
are supposed to work (security is checked on accessors) and split
what's currently not supposed to work (security on accessors does not
work in the corner case of using the default read permission, 'Access
contents information' as a write permission) to another expected failure
test.

maybe a little to strict. I don't know how we can check that fields does
not display value without checking the markup in a so low level way

[erp5_ui_test_core, erp5_dms_ui_test, erp5_km_ui_test, erp5_configurator_standard_ui_test] setFile command does not need pause command now.

[erp5_web_renderjs_ui] Show select column in view dialog if listbox's select column checkbox is checked.

[erp5_configurator_standard_ui_test] Fix file uploading tests. Use setFile selenium command to avoid security error.

31804f68 was merged too soon.

/reviewed-on nexedi/erp5!913

It was possible that the previous server socket did not have enough time
to expire, which could cause an "Address already in use" exception.

url
- corresponding test added

- improve OfficeJS applications by reducing the quantity of code to be written and reuse the ERP5 configuration (portal_type, actions, forms, etc.) instead to generate the app

  The API changed on the slap, this commit follow up the changes.

Which is useful when debugging tests

Some files in the Skin Folder was not deleted by mistake

/reviewed-on nexedi/erp5!914

'only_visible' in essence checks 'Add portal content',
But here we care for View permission really, since user can have worklist in a document
even if he/she does not have the rights to add content to the module.

otherwise naturalWidth/naturalHeight may be 0