- Integrated Grid object for data storage.

time ./task lo

			old	new
		real	0.262	0.018
		user	0.201	0.013
		sys	0.048	0.004

		~1200-1400% faster

	time ./task completed

			old	new
		real	3.991	4.014
		user	2.821	2.832
		sys	1.165	1.169

		~0.3-0.5% slower

src/Grid.cpp

@@ -113,6 +113,15 @@ void Grid::add (
   insertCell (row, col, new Cell (value));
 }
 
+void Grid::add (
+  const unsigned int row,
+  const unsigned int col,
+  const char* value)
+{
+  expandGrid (row, col);
+  insertCell (row, col, new Cell (std::string (value)));
+}
+
 void Grid::add (
   const unsigned int row,
   const unsigned int col,