[Fedora-packaging] RFC: Update to XEmacs packaging guidelines [(x)emacs-filesystem]

Dear All, I've just submitted a ticket to FPC to update the (X)Emacs packaging guidelines. Please see: https://fedorahosted.org/fpc/ticket/68 The reason for this proposed update is as follows. Consider the following very common situation: a package's principal functionality does not require (X)Emacs, but the package also includes some auxiliary Elisp files to provide support for the package in (X)Emacs. Presently the (X)Emacs guidelines require that the package split those Elisp files out into a subpackage (called emacs-foo) which Requires (X)Emacs. This was done to avoid the main package dragging in (X)Emacs and related dependencies for when a system administrator doesn't want to install (X)Emacs; this is necessary as the (x)emacs-common packages own the /usr/share/site-{lisp|package} directories where the Elisp files would be installed. Ville Skytta recently suggested that a better solution is to create emacs-filesystem and xemacs-filesystem sub-packages which own the /usr/share/site-{lisp|package} directories. This then allows packages to drop Elisp files into the (X)Emacs tree without pulling in (X)Emacs as dependencies. This has now been done. Therefore I have updated the Emacs packaging guidelines to reflect this change. Please see the updated draft here: https://fedoraproject.org/wiki/PackagingDrafts/Emacs Comments welcome! Best wishes, Jonathan.