fix newest template test
prepare to compare multi-field template output
back to templates as of Feb 23
now include defaults again in tem instances

We no longer try to handle defaults updating (http://arclanguage.org/item?id=15690)
why did we decide to skip unknown nil fields?
.
.
report of tem semantics

We've struggled to visualize this enough.
Now also obvious how current semantics differ from arc3.1.