Create a global ontology

[niio972]

Create a global ontology with a different uri base.
Modification example :
From http://www.phenome-fppn.fr/vocabulary/2018/oepo
To http://opensilex.org/vocabulary/2018/oepo

Concerns :

• the ontology : OpenSILEX/ontology-phis-oepo-field
• the web service : OpenSILEX/phis-ws
• the web app client : OpenSILEX/phis-webapp

Usefull to :

• specify ontology per instance with specific concepts
• may dereference possible