code.ml: fix backslash typo in string
what's_new: move link to comprehensive list of changes
releases: import http://caml.inria.fr/ocaml/release.en.html

Partly addresses #39.
move svn info from install to new file

As discussed in #75, this information is about releases, not an
installation instruction.
import http://caml.inria.fr/ocaml/release-prev.en.html

Partly addresses #39.
releases: fix links to Inria
Tutorial "Null Pointers, Asserts and Warnings": syntax highlight.
Syntax highlighting: add keyword "mutable".
move releases.html to 4.00.1.html

This will make it easier to manage new releases. We'll be able to leave
4.00.1.html as-is, create a new file for the new release, and change
the symbolic link latest.html to the new file.
3.12.1.html: fix title
3.12.1.html: add link to earlier releases
4.00.1.html: fix title
4.00.1.html: move alternative compilers info
Syntax highlighting: allow "let ( op )" bindings.
move What's New content into respective release pages

This makes more sense now that we have a page for each major release.
It is also consistent with how it was on caml.inria.fr.
3.12.1.html: add license info
4.00.1.html: pure whitespace fix
remove godi from release pages

GODI already mentioned in install page.
releases: link to svn.html under Source section
Syntax highlighting: fix handling of space post let-id.

The presence of the new alternative for let-id messed this up.