Layers of 'osmose_default_model_DefaultImpact',
'osmose_default_model_DefaultMechPower',
 'osmose_default_model_DefaultInvCost' and
'osmose_default_model_DefaultOpCost',
are replaced by
'DefaultImpact', '
DefaultMechPower',
'DefaultInvCost',
'DefaultOpCost'.
The goal is to simplify the long name of layers.