Rotate array in writefln?

[Chris Katko]

I need to rotate an array by 90 degrees, or have writefln figure 
that out.

I need, say:

0 4 5 6
0 0 0 0
0 0 0 0
0 0 0 0

But it's outputting:

0 0 0 0
4 0 0 0
5 0 0 0
6 0 0 0

int [4][4] data;
file.writeln(format("%(%-(%d %)\n%)", data));