Revert "Fixed kernel.genmodel (removed body attribute from eOperations)."

This reverts commit ea0264b5.

org.fortiss.tooling.kernel/model/kernel.genmodel

@@ -67,7 +67,8 @@
         <genFeatures createChild="false" ecoreFeature="ecore:EAttribute kernel.ecore#//constraints/ConstraintInstance/constraintName"/>
       </genClasses>
       <genClasses image="false" ecoreClass="kernel.ecore#//constraints/IConstraintInstanceStatus">
-        <genOperations ecoreOperation="kernel.ecore#//constraints/IConstraintInstanceStatus/getConstraint"/>
+        <genOperations ecoreOperation="kernel.ecore#//constraints/IConstraintInstanceStatus/getConstraint"
+            body="return (ConstraintInstance)this.eContainer();"/>
       </genClasses>
       <genClasses ecoreClass="kernel.ecore#//constraints/OutdatedConstraintInstanceStatus"/>
       <genClasses ecoreClass="kernel.ecore#//constraints/FailedConstraintInstanceStatus"/>