Link All Axes in Figure

This is just a simple utility function to find all subplots in a figure and link their axes.

Syntax is the same as linkaxes, except without passing in the handles to the axes to link. It replaces:
figure;
ax(1) = subplot(2,1,1);
plot(rand(10,1));
ax(2) = subplot(2,1,2);
plot(1:10);
linkaxes(ax,'x')
clear ax

with:
figure;
subplot(2,1,1);
plot(rand(10,1));
subplot(2,1,2);
plot(1:10);
linkaxesInFigure('x')