Moved wukong specific code from app.xml to new wkpf-app.xml.

Applications that will use the profile framework should import wkpf-app.xml instead of app.xml. wkpf-app will in turn import app.xml, and add two wukong specific targets to compile the Java code and wkpf tables (target wkpf-all), or just the wkpf tables (target wkpf-tables-only).