* Clarify what the first option for the marker does.
* Fix unsetting a marker deliberately
* Fix several bugs with updating marker associations after changing a term.
* Fix SQL error when setting a marker on existing terms.
* Add function to recompute markers after changing a term.

* 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.

gmap_views support added.
gmap_location block support added.

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.