Location CCK naming and package

The naming of the Location CCK module is unfortunate. It probably made sense during the D6-D7 migration, but it's antiquated and confusing now, especially for new users who may never have even heard of CCK.

It should just be Location Field. I understand that this is a pretty big change to make, but it needs to happen at some point. Here's a baby patch to get started that at least moves the module from the "CCK" package to the "Fields" package.