I continue testing the MediaWiki 1.21.0rc1 distribution. I continue trying to make the ShortURL. I modified added several lines to /etc/apache2/httpd.conf and modified the LocalSetting.php folowing instructions at http://shorturls.redwerks.org/?fcgi_pass=127.0.0.1%3A9000&source=userdat... but this did not work; the brouser cannot find the short URL. It seems to me, modification of /etc/apache2/httpd.conf does not affect anything. I am not sure if this is failure of the MediaWiki 1.21.0rc1 . In certains sense, it is a fault of the distribution: It includes many extensions, which seem to me useless, while the important extensions, namely, ShortURL and MathJax, are not included; so, one has to learn Apache, PHP and other things, in order to understand the instructions, how to install these extensions and how to make them work.
I hope, Mark A. Hershberger makes the distribution, that includes at least Cite, MathJax, ShortURL, Poem by default. The first three extensions are the most important, but the fourth extension, "poem", is also useful: it simplifies the copypast of the C++ codes; so, better to keep it in the future verions. Now only two of the four extensions I need are included in the tarball.
My preliminary concluson about MediaWiki 1.21.0rc1 : In the present form of the distribution of Mediawiki, the installing of the extensions requires long, heavy and dangerous (at least for the server) work and/or a lot of skills from the downloader.