[wsrp-wsia] [change request #254] Flatten UserProfile

Document: Spec v0.92

Sections: 6.1.18 - 6.1.18.7

Requested By: Alejandro Abdelnur

Old text: embedded structures

New text: flatten it to name value pairs

Reasoning: To reduce XML parsing and for performance reasons. I know this
proposal was rejected before but the performance was not used.