Two in one... Gallery links suppressed if we have already seen the images fullsize in the teaser and body

Also option to suppress the gallery link on the teaser.

I attach a modified version of the node_images.module with these changes in place and commetns outlined by \\ WS:
...
\\ WS :

Please review them and see what you think.

I did add a function to the api to count the number of images for the specified node, something which was useful in doing the above changes.

Feel free to use this code in the next revision.