[ESS] small elisp library for iESS

[Richard M. Heiberger]

There are only a limited number of function keys.
I suggest you pick the ones that you like and include them
in a function, say ess-luque-keys, that is only loaded if
the variable ess-luque-keys is non-nil (yes, same name for
the function and the variable).  Since they are isolated, anyone
who wants them can easily modify the assignment.  The hard part
of function keys isn't assigning them to a key, it is figuring
out what you want them to do.