[DROOLS-154] Improve the isA trait evaluator to work with literals
[DROOLS-155] Failed static import throws a NPE
[DROOLS-160] Improve trait @aliasing capabilities
[DROOLS-156] Deletion of EvalConditionNode raises IndexOutOfBoundsException in some combinations
[DROOLS-162] Unsupported polymorphic declarations are not detected until runtime
[DROOLS-159] Wrong execution order when explicitly setting SalienceConflictResolver
[BZ-971001] [BZ-971008] Fix grouped accessors using '&&' and '||', optimize inline casts and nullsafe references