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Packing Blocks from Matrix B                                            [TOC]
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In the cache optimized GEMM-Operation $\beta C + \alpha A B \to C$ the matrix
$B$ gets partitioned into blocks with maximal dimension $K_c \times N_c$.  Each
block $B_{l,j}$ of $B$ gets packed into row-major vertical panels with $N_r$
columns.

Exercise
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- Implement function `dpack_B` in the test program below.  Before you start
  coding: Make yourself familiar with the test program below.


Simple Test Program
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:import: session16/simple_test_packb_ex.c