bug#35262: Maybe make opening in currently running emacs the default

[積丹尼 Dan Jacobson]

Say, most other programs are smart enough to know that
$ chromium       a.html & #starts chromium
$ chromium       b.html   #opens b.html in the above running chromium
$ chromium       c.html   #opens c.html in the above running chromium

Alas, for emacs one still needs
$ emacs          a.html & #starts emacs
$ emacsclient -n b.html   #opens b.html in the above running emacs
$ emacsclient -n c.html   #opens c.html in the above running emacs
plus one needs server-start...

Anyway maybe the new way should be the default when running in
X-windows, etc. And maybe even eliminate the need for the & on the
first line, to be able to type the further lines.