FAQ: remove "Inria" which is no longer capitalized.
Code: add directives #load and #install_printer
Syntax highlighting: add support for "let f : type = function".
Tutorials: Basics: improve code indentation.
Syntax highlighting: regain support for "let f (x: t)..."
Syntax highlighting: add support for "method x : t =".
FAQ: Prefer keyword "fun" (used by most people).
Tutorials: syntax highlight "Data Types and Matching".
Syntax highlighting: add support for "method f args =".
Tutorial: syntax highlight "Functional Programming".
Syntax highlighting: add support for "val f :".
Syntax highlighting: improve support for "type t".
Syntax highlighting: improve support for modules.
Tutorial: syntax highlight "Modules".
Tutorials: syntax highlight "If Statements, Loops and Recursion".
Tutorials: syntax highlight "Objects".
Tutorials: replace "Programming style" by "OCaml Programming Guidelines".

"Programming style" was almost empty and referred to "OCaml
Programming Guidelines" anyway.
Tutorials: syntax highlight "Garbage Collection".
Tutorials: syntax highlight "File manipulation".
Tutorials: syntax highlight "Introduction to Gtk".

This is not fully satisfactory but I do not want to require that
anybody who compiles the site has Gtk installed.