Formatted input from text file

[IK]

Hmm does your code generate a 1D `array` as a grid, bearophile?
Anyway thanks, I'll compile it shortly.

My own code evolved to what's below and gives a Range violation.
Also I don't understand why formattedRead can't just accept a casted
`opSlice.dup`, is it a bug?

void main()
{
	uint[20][20] grid;
	auto input_file = new MmFile("p011_input.txt");
	string temp = cast(string)input_file.opSlice;

	formattedRead(temp, "%(%(%s %)\n%)", &grid);
}