Adapt LaTeX sources to a uniform style

[clange]

A request from user Pascal Fontaine:

I think the process can be further automated, by automatically compiling
(with the right page numbers, uniform title emphasis style,
letter format, CEUR footnotes, etc...), creating the zip, maybe checking
correspondence of titles and authors between TeX and Easychair (I know
and fix various little things). You could restrict the input style to a
few of them.