co'e'o SE experimental cmavo

indicate that the seltau can also modify the tertau's place.

This allows tanru to produce a merged place structure more flexibly and freely. See also: co'au (flip tanru place structure basis between tertau and seltau; SE grammar), co'ai (new grammar to apply to the remaining attached sumti), do'e'e (‘sticky’ co'e'o with a more complicated grammar).

In notes:

co'au (exp!)
change place structure basis of a tanru to the left unit (repeatable).
co'ei'au
add seltau to a bridi after sumti.
do'o'e (exp!)
with a vague / ommitted / elliptical / unspecified / [possibly alternative] place structure.