Re: Unify mark-foo commands

[Richard Stallman]

    * Doing C-M-SPC multiple times pushes multiple marks on the mark
      ring.  But maybe the user expects C-M-SPC C-M-SPC to only put one
      mark on the mark ring, like C-u 2 C-M-SPC would have done?

Definitely it should put only one mark on.

    * If mark-page is called with an argument, it doesn't mark more pages.
      Instead, it marks _other_ pages.  I didn't change that command, as

Good.  That command is not in the same class.  mark-paragraph and
mark-defun should not be changed either.