This patch modifies the hwp controller and the hwp views to return data in XML format.
Specifically, the create, destroy, index and show methods have been extended and the XML
data is returned by suitably formatted templates.
NOTE: When a particular hardware_profile_property is nil, I return the string
"nil" in the XML template instead of an empty XML element. This is due to the
special significance of nil values in hwps.
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