fix up gmap_location a bit.
change an old update to point to the issue queue -- not worth rewriting for d7.

Rename permissions:
"show node map" -> "view node map"
"show user map" -> "view user map"
"user locations" -> "view user location details"

Also, I changed some % to %%. Although this wasn't a problem in practice, using a single % means relying on internal behavior of db_query.

* Reduce the number of variables used by the location map block.