Update the PARDISO interface to match other sparse solvers.

- Add support for Upper or Lower inputs.
- Add supports for sparse RHS
- Remove transposed cases, remove ordering method interface
- Add full access to PARDISO parameters

Eigen/src/Core/util/Constants.h

@@ -188,7 +188,9 @@ enum {
   /** View matrix as an upper triangular matrix with zeros on the diagonal. */
   StrictlyUpper=ZeroDiag|Upper,
   /** Used in BandMatrix and SelfAdjointView to indicate that the matrix is self-adjoint. */
-  SelfAdjoint=0x10
+  SelfAdjoint=0x10,
+  /** Used to support symmetric, non-selfadjoint, complex matrices. */
+  Symmetric=0x20
 };
 
 /** \ingroup enums