* Remove revision tracking, it doesn't work in D5 as taxonomy associations are NOT revisioned. Update required.
* Delete marker associations properly.
* Add a canary function so other modules can adapt to this change.
* Views note: You *may* have to resave your location-related views. I had to change the join conditions slightly.

whitespace, follow coding style document regarding file headers, some string changes from Bevan's patch.

Taxonomy markers!

Works on map/node.
Theoretically easy to get working on gmap_views, but I don't wish to test that theory this evening.