extra test cases for sparse matrices
efficient setRow for SparseRowMatrix
Fix issue where new vector created for row when calling getRowView.
Faster nonZeroIndices which does not iterate over entire backing data array but only nonzero indices.
Add optimized case for set method when other vector is also sparse.
Merge branch 'develop' into sparse-speed
Added test for new ASparseIndexedVector#nonZeroIndices and fixed variable references after moving from SparseIndexedVector.