Multimenu

Adding menu module for multiple Result Based Management level chains to separated in different menus at the top of Odoo.

```
Progam              | Other Program Top Menu
====================|=======================
                    |
Results             | Results
-------             | -------
Mission             | Mission type 2
Final Result        | Final Result 2
.                   | .
.                   | .
.                   | .
Activity            | Activity 2
                    |
Configuration       | Configuration
-------------       | -------------
Result Levels       | Result Levels (filtered Mission type 2, etc)
.                   | .
.                   | .
.                   | .
```


Can you explain in docstring the difference between test_unlink1, test_unlink2 and test_unlink3 please?