Align api4kb:Environment with dol:Graph

[lonniev]

The dol:HeterogeneousEnvironment concept is a rather specialized structure consisting of a dol:LanguageGraph, dol:LogicGraph and a connection between them that is a dol:supports relation.

In contrast, the api4kb:Environment is closer (if not identical) to dol:Graph . So reusing the "Environment" name is going to lead to confusion.

[lonniev]

this should be reassigned