- move CompressedStorage and AmbiVector into internal namespace

- remove innerVectorNonZeros(j) => use innerVector(j).nonZeros()

Eigen/src/SparseCore/CompressedStorage.h

@@ -25,7 +25,10 @@
 #ifndef EIGEN_COMPRESSED_STORAGE_H
 #define EIGEN_COMPRESSED_STORAGE_H
 
-/** Stores a sparse set of values as a list of values and a list of indices.
+namespace internal {
+
+/** \internal
+  * Stores a sparse set of values as a list of values and a list of indices.
   *
   */
 template<typename _Scalar,typename _Index>
@@ -236,4 +239,6 @@ class CompressedStorage
 
 };
 
+} // namespace internal
+
 #endif // EIGEN_COMPRESSED_STORAGE_H