This function adds all the links to a Kohonen type network. It supposes that
all units have already been added to net using the create_koh_units
function. All units in the input layer are linked to all units in the map.
For reasons of memory efficiency, only input links are created; output links
are not used.
NOTE
This function is called by the create_koh_net function.
The malloc_link function is used to allocate the links.