partial.xspec using `f:make-ref' instead of manual construction
`f:args' ignores adjacent data
`f:set-args' respects and echoes adjacent data by references

Was previously clobbered.
Assurances that all other `f:*' functions properly handle adjacent data
`arity/ref.xsl' documentation updated to reflect data adjacency guarantees
All ref functions now have data adjacency guarantees

Accessors will ignore adjacent data and mutators will echo them, by
reference, unchanged.