I just pushed to `scratch/replace-region-contents` a small series of
patches which consolidate `replace-buffer-contents` and
`replace-region-contents`, marking `replace-buffer-contents` as obsolete
and making `replace-region-contents` usable as a replacement for the
`replace-region` I'd still prefer (the difference is just a mere
`-contents` plus an extra `0` argument, but as argued here before, this
sets a trap for the unwary user who may unwittingly end up calling
a very expensive function).

The first patch is the one which makes the actual change the subsequent
patches just change other code to use the new functionality.


        Stefan