Merge pull request #173 from VinceMacBuche/ust_3474/implem_3475/Link_event_log_to_change_request

Ref #3474: Link event log to change request
Merge pull request #172 from VinceMacBuche/bug_3465/improve_jspopup_v2

Ref #3465: Another update on javascript popup management
Merge pull request #162 from VinceMacBuche/ust_3455/impl_3456/Improve_change_request_owner

Fixes #3455 : Improve change request ownership
Ref #2475 : fix method call
Fixes #3452 : Improve workflow user experience