A plugin that moves attachments to Rackspace Cloudfiles CDN.
No. This plugin is for putting WordPress Attachments and files in the WordPress uploads directory on a CDN where they belong because WordPress has no native feature for that. This is not a caching plugin and it is not intended to be.
No. This plugin simply pushes all uploaded files to a CDN network.
You can optionally have the plugin remove the local copy of the file since it is not needed and taking up valuable server space.
No. Those things typically belong in revision control and you should have your deployment system take care of their linking.