with dynamic property_sheets

empty form_id property

first slash in form_id of proxy field is not considered as empty
portal_skin of form

use_unicode=False

also fix default value search in related_key_dict

add test case in erp5_ui_test

/reviewed-on nexedi/erp5!90

/reviewed-on nexedi/erp5!94

Sanitizing client data would help to prevent such issue.

/reviewed-on nexedi/erp5!92

(400 or 502) + add test case in erp5_ui_test

… 30 minutes difference.

/reviewed-on nexedi/erp5!93

caching_instance_method not used

erp5_simulation_test: as `erp5_default_business_process` is required in some test cases
erp5_simplified_invoicing: as `Invoice Line` should be allowed by `Sale Invoice Transaction`
erp5_configurator_standard_accounting_template: as `default_invoice_rule` business process is needed

defined before using it as argument for isURLAncestorOf.

@vpelletier, this caused a bug, since empty came_from would crash isURLAncestorOf when urlparse is called for this url (https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/Core/Folder.py#L517). I think this is a way to solve, I do not know if isURLAncestorOf should be changed also to return something in such situation. 

/reviewed-on nexedi/erp5!89

This ERP5 service worker provides the same functionnality than appcache (nothing more).
No need to activate it while appcache is still the only techno supported by most browsers.

in this context, int index is priority

This caused reports to be skipped sometimes

getOwner returns a python document.

Only support Base_jumpToRelatedObject for now.