bug#684: 23.0.60; text-mode redefines "\es", the new search-map prefix

[Chong Yidong]

> > Text-Mode redefines the new search-map prefix "\es" with
> > center-line. Maybe this needs to be changed too.
>
> Instead of removing these useful commands from key bindings,
> I think we should find a good replacement.
>
> Starting from Emacs 22 we dedicated a special prefix map M-o
> just for such formatting commands.  So I propose to move these
> commands to the following keys:
>
> M-o M-s    center-line
> M-o M-S    center-paragraph

Isn't the M-o prefix key used for text properties?  I don't think it's
such a good fit.  Maybe M-g would be better.  WDYT?