template <class LINKCNT> ostream& writeLinks(ostream &o,const LINKCNT &cnt)

This template function writes a container of links to a stream.

LINKCNT should be a container as defined by the STL
*LINKCNT.valuetype must have a method writeTo(ostream&), a method Node *from() and a method Node *to().

The data written to the stream will be of this form:

<size of the container>
(<address of from() node> <address of to() node> [<additional info>] )*