Reorder authors: move TS first, add empty lines between groups

I inserted empty lines between chapters, between roles,
as well as at page breaks inside a given chapter and role.
Reorder authors to match order in source document

In source:

* "Pavel Ya Groisman" is sorted at G for "Groisman" (not Y for "Ya"),
* "Pedro Leite da Silvia-Dias" is sorted at S for "Silvia-Dias"
* "J. De Wolde" is sorted at W for "Wolde" (not D for "De")
* "K. Van Scoy" is sorted at S for "Scoy" (not V for "Van")
Add 1 missing author in AR2 WGI TS

* 1 LA author: "B. Callander"
Replace 2 authors in AR2 WGI Ch2 (misspellings)

These two misspellings come from the OCR: the text copied
from the PDF differs from the text displayed in the picture:

* "P. Eraser" (copied) -> "P. Fraser" (displayed)
* "M. Lai" (copied) -> "M. Lal" (displayed)
Replace 1 more author in AR2 WGI Ch2 (same last name)

The first name initial is not compatible with the first name
on file: "A. Slingo" (source) vs "Julia Slingo" (database export).
The institution, however, is the same.
Replace 5 authors in AR2 WGI Ch3

* 5 CA authors: "J. Angell",
                "J. Churc" (OCR misspelling),
                "H. Diaz", "P. Jones",
                "Q. Zu" (removed "Jiangsu", actually
                         first word of the institution)
Add 1 missing author in AR2 WGI Ch3

* 1 CA author: "E.V. Rocheva"
Remove 1 extra author from AR2 WGI Ch3

* 1 CA author: "V.N. Razuvaev"
Replace 2 authors in AR2 WGI Ch4

* 1 LA author: "A. Slingo" (incompatible first name)
* 1 CA author: "A. Barros" (OCR misspelling)
Add 1 missing author in AR2 WGI Ch5

* 1 LA author: "N. Smith"