[XeTeX] wspr's realscripts & updated xelatex templates

[Joel C. Salomon]

I’ve not been following the recent back-and-forth regarding which
XɘLaTeX packages are now obsolete, and which are compatible with LuaLaTeX.

Right now my personal style files files have lines like these:
	\ifxetex
		\RequirePackage{fontspec, xunicode, xltxtra}
	\fi
	\ifluatex
		\RequirePackage{fontspec}
	\fi
Am I missing something here?  Where does realscripts fit in?

—Joel