ElPkg infrastructure update.

    Implement XEmacs package exportation for simple packages as well.

    2013-06-03  Didier Verna  <didier@didierverna.net>

	* local.inc (XP_DIR):
	(XP_PKG): New variables.
	* local.mak (convert): Rename to xp-dist and implement for simple
	packages.
	* lisp/local.mak (xp-dist): Implement for simple packages here.

    Rename local install targets to avoid confusion with user-level ones.

    2013-06-02  Didier Verna  <didier@didierverna.net>

	* local.mak (install-www): Rename to www-dist.
	(uninstall-www): Rename to www-undist.
	(install-elpa): Rename to elpa-dist.
	* lisp/local.mak (install-www):
Install to xemacs-base package.

2013-06-03  Didier Verna  <didier@didierverna.net>

	* local.inc (XP_PKG): Set to `xemacs-base'.