Test BVGetSplitRows (length 10, l=3, k=5, nc=0).
  type: nest
  Matrix object:
    type=nest, rows=2, cols=2
    MatNest structure:
    (0,0) : type=seqaij, rows=10, cols=10
    (0,1) : NULL
    (1,0) : NULL
    (1,1) : type=constantdiagonal, rows=10, cols=10
  type: seq
0.
0.
0.
1.
4.
7.
10.
0.
0.
0.
