Supports the case where Products.DCWorkflowGraph is not present.
Even though we are removing Products.DCWorkflowGraph from the
software release, we don't remove this monkey patch yet, because
this monkey patch also fixed a severe security issue. We keep the
patch for the cases where a recent ERP5 runs on an old SlapOS where
the product is still there.

This change just moves the existing code in a try/except ImportError
block

Delete the content of the cache storage (used by erp5js), unregister the service worker and force the browser to reload.

1. add select by project
2. add select by type
3. fix column url

it's not finished, rework if need

Permissions are managed by the document_publication_worflow

1. don't manipulate data base to avoid resend to web service in case of data base conflict
2. use existing property
3. change alarm frequency

1. display employee number
2. add preview
3. add parameter to send to maileva

maileva

erp5_base: add constraint and action to make sure Employee Number is unique instead of manually setting