A table with MxN dimensions is converted to a MxN matrix when given in
:var to a Calc source block. A table with a single row is converted
to a vector (i.e., row vector).
* lisp/ob-calc.el (org-babel-execute-src-block:calc): Construct the
right data structure to pass tables as matrices to Calc.
* testing/lisp/test-ob-calc.el: Add tests for ob-calc, and this new
feature.
* etc/ORG-NEWS: Announce the feature.
* mk/default.mk (BTEST_OB_LANGUAGES): Enable ob-calc tests by default.