This package contains extensions for GNU emacs of the site-lisp path of emacs. It puts together the AUC-TeX package (version 9.7p) and a system wide startup file (site-start.el) which uses a few lisp macro files combined by us. For copyright have a look on these files.
Note, that GNU-Emacs and XEmacs are incompatible. They use different binary code for compiled lisp files and they have different builtin lisp functions, not only names of such functions are different. Therfore you will find in /etc/skel/ an .emacs for your personal ~/.emacs which will switch between different init files.
Fore GNU emacs there is a /etc/skel/.gnu-emacs for a personal ~/.gnu-emacs and therefore your ~/.emacs or ~/.gnu-emacs files should be checked against the /etc/skel versions.
You can always make your preferred ~/.gnu-emacs by copying the /etc/skel/.emacs and /etc/skel/.gnu-emacs file in your HOME directory and incorporating your extensions or changes.