Attached patch formats vector and matrix results from a Calc source
block as Org table.  To test, try

    #+NAME: test
    | 1 | 2 |

    #+BEGIN_SRC calc :var t=test
      2 * t
    #+END_SRC

It should return

    #+RESULTS:
    | 2 | 4 |

now.  The patch passes the old tests, and I added three new tests to
check the correctness of this conversion.