Fix compilation issues with icc and g++ < 4.1. Those include:

- conflicts with operator * overloads
 - discard the use of ei_pdiv for interger
   (g++ handles operators on __m128* types, this is why it worked)
 - weird behavior of icc in fixed size Block() constructor complaining
   the initializer of m_blockRows and m_blockCols were missing while
   we are in fixed size (maybe this hide deeper problem since this is a
   recent one, but icc gives only little feedback)

Eigen/src/Core/Functors.h

@@ -141,6 +141,9 @@ struct ei_functor_traits<ei_scalar_quotient_op<Scalar> > {
   enum {
     Cost = 2 * NumTraits<Scalar>::MulCost,
     PacketAccess = ei_packet_traits<Scalar>::size>1
+                  #ifdef EIGEN_VECTORIZE_SSE
+                  && NumTraits<Scalar>::HasFloatingPoint
+                  #endif
   };
 };