Changed the link to the wilkinson prize as it was 404
Replaced the broken links to the diode graph with the ones that are used in the english tutorial nowadays
Fixed the links to the proof humor on princeton.edu
Fixed the example command for the SVN checkout (the /dir suffix was wrong)
Removed the Win32-MSVC section from the 3.12 release page as there is no such release (Link is 404). As no one noticed this yet, it is probably the best if the whole paragraph gets deleted instead of producing a new build of this ancient version and publish it under the given URL
Dead link to GCC nested functions in japanese replaced by arhive.org link
Dead link to elsewhere.org replaced by archive.org link
Dead link to elsewhere.org replaced by archive.org link (same as before commit but now for the italic version
Merge pull request #604 from Teemperor/master

Fixed dead links.