Rename property #outgoingTraitUsages of FamixTTraitUser ?

[NicolasAnquetil]

FamixTTraitUser has a relation #outgoingTraitUsages to FamixTTraitUsage (opposite: #user)

I find the name outgoingTraitUsages difficult to understand.

I propose to rename it: usedTraits ?
But FamixTTraitUsage is an association, so the link is not direct to the usedTraits.
May be traitUsage ?

Note: should check what are the names in the FamixTTraitUsage to ensure the naming is coherent

(see also #838)