Re-implement RectArray and Matrix (#730)

This re-implements the RectArray and Matrix classes:

* Matrix is no longer derived from RectArray, but instead uses RectArray internally as storage.
* RectArray is now implemented in terms of a continuous `std::vector`, rather that manually-allocated pointer-to-pointer
* Internal implementations in both classes re-written to use STL algorithms and/or efficient iterators, as appropriate
* General modernisation cleanups.

Author: tturocy

Makefile.am

@@ -249,7 +249,6 @@ core_SOURCES = \
 	src/core/vector.h \
 	src/core/recarray.h \
 	src/core/matrix.h \
-	src/core/matrix.imp \
 	src/core/integer.cc \
 	src/core/integer.h \
 	src/core/rational.cc \

src/core/matrix.cc

@@ -20,8 +20,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 //
 
-#include "core.h"
-#include "matrix.imp"
+#include "matrix.h"
 
 namespace Gambit {
 
@@ -30,9 +29,4 @@ template class Matrix<Rational>;
 template class Matrix<Integer>;
 template class Matrix<int>;
 
-template Vector<double> operator*(const Vector<double> &, const Matrix<double> &);
-template Vector<Rational> operator*(const Vector<Rational> &, const Matrix<Rational> &);
-template Vector<Integer> operator*(const Vector<Integer> &, const Matrix<Integer> &);
-template Vector<int> operator*(const Vector<int> &, const Matrix<int> &);
-
 } // end namespace Gambit