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This Merge Request adds ```reachability_workflow``` and adds it to all Coordinate types  (Adress, Email etc.)
so that the can be marked as ```reachable``` or ```unreachable```.
It also adds ```coordinate_interaction_workflow```, so that when a coordinate text changes actions can be triggered.
The default behaviour is that, when coordinate text changes for an 'unreachable' Coordinate, it is marked as reachable.

We already discussed this with @jerome , but I cc @nexedi , since this can break compatibility in projects, because
in the past Coordinates acquired ```validation_state``` by their parent document (Person, Organisation, etc).
So now, if some code checks ```getValidationState``` (though it should be checking on the parent) for Coordinate, or searches Catalog with ```validation_state``` (though it should be ```parent_validation_state```), behaviour will change.

Test Result <a href="https://nexedijs.erp5.net/#/test_result_module/20180608-2D68AF16">here</a> seems good (3 failures in UI tests that seem unrelated)


/reviewed-on nexedi/erp5!691