A small example on how hooks works in Guile.
Made by Stefan Petersen <spe@stacken.kth.se> 
for Guile 1.4.
(http://www.stacken.kth.se/~spe/)

The C code defines a hook called 'my-hook'. Then
it is defined in Scheme what the hook should do.
Then the C code calls the routines in the hok, if 
there are any routines defined.

The purpose is only to serve as a simple example on 
how hooks works.
