* extend Map to allow the user to specify whether the mapped data

is aligned or not. This is done using the Aligned constant:
  Map<MatrixType,Aligned>::Map(data);
* rename ForceAligned to EnforceAlignedAccess, and update its doc,
  and emphasize this is mainly an internal stuff.

Eigen/src/Core/util/Constants.h

@@ -196,8 +196,8 @@ const unsigned int UnitLowerTriangular = LowerTriangularBit | UnitDiagBit;
 
 enum { DiagonalOnTheLeft, DiagonalOnTheRight };
 
-enum { Aligned, Unaligned };
-enum { ForceAligned, AsRequested };
+enum { Unaligned=0, Aligned=1 };
+enum { AsRequested=0, EnforceAlignedAccess=2 };
 enum { ConditionalJumpCost = 5 };
 enum CornerType { TopLeft, TopRight, BottomLeft, BottomRight };
 enum DirectionType { Vertical, Horizontal, BothDirections };