Reorder CLA authors to match order in source document
Replace 3 authors in AR3 WGII Ch19 (same last name, different persons)

* 2 CLA authors: "Joel B. Smith (USA)",
                 "Hans-Joachim Schellnhuber (Germany)"
* 1 CA author: "J. Price (USA)"
Add 1 missing author in AR3 WGII Ch19

* 1 CA author: "T. Wigley (USA)"