clean up nthcdr
tweak mods further
Merge branch '12-namedcnt-cleanup' into 13
define and use DUP_CONS macro in util.c
Merge branch '12-namedcnt-cleanup' into 13
mods file
Merge branch '12-misc-cleanup' into 13
typo
Merge branch '12-namedcnt-cleanup' into 13