Commit the (hopefully) non-contentuous NEW_STRING changes. This is the

Commit the (hopefully) non-contentuous NEW_STRING changes.  This is the
batch that's largely mechanical and for formats, at least mostly passing
testo.  It's all still disabled by default and much of it is pretty dicey,
but this patch has been growing in my tree and I wanted to get it committed.

Later, when we take out the NEW_STRING stuff, I'll refactor the stuff around
these changes which were often done to preserve fidelity to the original C
versions even when there is a better way now.