Corrections to subset mode. Addresses #271 (#321)

* Correct a bug introduced with localization support

* Corrections to subset mode. Fixes #271 (#10)

* Ensure profile/subset requirements are extracted from the input profile where an object is used, not where it is defined. (For example, "Status" is defined in the "Resource" schema, but it should be included in a profile within the object in which it is referenced.)
* Always expand a $ref inline if there is a profile mention for that resource.
* Warn when a profile specifies requirements on the IPAddresses, Redundancy, Resource, or Settings schema.