Little fix
Merge remote-tracking branch 'origin/erik' into dev

Conflicts:
	gs-kernel/src/main/java/org/genericsystem/kernel/systemproperty/constraints/GetInstanceConstraint.java
Improve constraints
Little fix
Fix constraint trigger
Little fix
Merge remote-tracking branch 'origin/dev' into erik

Conflicts:
	gs-kernel/src/main/java/org/genericsystem/kernel/AbstractVertex.java
	gs-kernel/src/main/java/org/genericsystem/kernel/systemproperty/constraints/InstanceValueClassConstraint.java