CeylonVisitor: Remove the global BinaryOperatorExpression since every case but EqualOp was handled specifically #1535
ExpressionTransformer: avoid potential NPE #1535
ExpressionTransformer: power is on Exponentiable, not on Numeric #1535
ExpressionTransformer: fix for #1535: do not rely on RHS type (unless we must)
Test erasure and power operator #1535
Add test for #1535: NPE when RHS numeric type can't be obtained
ExpressionTransformer: fix erasure issues with Scale operator #1535
ExpressionTransformer: fix erasure issues with Set operators #1535
Test more erasure issues with operators #1535
ExpressionTransformer: fixed Scalable type argument to use according to its definition, which is opposite of spec #1535
Updated test.src due to Scale operator fixes #1535