I have finally upgraded mediawiki to much newer version, since the installation was very old and was not updated in a while, and it stopped working altogether now when hosting was updated.
Security in new version has been improved, and you should be able to register new accounts and edit articles, anonymous editing is disabled and some things are restricted to minimum 4 days old accounts (such as creating new pages)
I have transferred images and pages from the old wiki, some parts of wiki are in need of updates, but the API reference library is very up to date as i re-did it a year ago, and it has not really changed much.
http://www.newtondynamics.com/wiki/index.php/Main_Page