Purpose is to extend the use of the newly-introduced activity view allowing
to see at a glance activities to perform on a given model. It eases daily
job of people working with activities.
Updated
* main partner menu action (Customers);
* membership partner main menu action;
* customers / vendors main menu action used in various other apps;
This commit is linked to task ID 1889413.
Thibault Delavallée
c75fa91ab8