Graph initialized from POM must not ignore the execution parameters

When the graph is initialized from a POM with some activated profiles containing dependencies, those dependencies were ignored and not included as direct dependencies.

When a graph root node is a Maven project (a POM), it must not be treated as a standard artifact: the generated root dependency must inherit all characteristics from the activated profiles, properties, exclusions...

• test-resolve will cover the "profile with dependencies" case,
• test2 will cover the "dependency with exclusions" case.