Massive changes to Node export file. (such as deleting it)

Here's the diff for reference, but I'm committing it straight away.

Looks like the upload module is gone too, and this functionality is streamlined into file fields.

Upload removal patch.

I have made further simplifications to node_export_file.

The module is now small enough to roll directly into node_export

One more patch with a few improvements.
I think that's about it.

That last patch also added a new config for supported field types.
I'm adding this to the hook_uninstall():

  variable_del('node_export_file_supported_fields');