IDM-03: Change an XSEDE user profile

Executive Summary: 
An XSEDE user wants to change his/her XSEDE user profile.
User Importance Summary: 
We need a way for the XSEDE system to identify individual human beings. There also needs to be a way for those human beings to record information about themselves that the system can access.
Target Communities and Sizes: 
All XSEDE-registered users - 10,000 < N < 99,999