(1) New file operation file-mine-p, returns true if the file is owned
by the "calling user". For non-special files, the calling user is
the user who invoked Emacs. For Tramp files, the calling user is
the user logged into the remote host.
(2) New file operation file-calling-user, returns the calling user, as
defined in (1).
(3) Augment the return value of file-remote-p to indicate the calling
user. The return value could be augmented to also indicate the
remote host, if the file is remote.
#3 seems kludgy, so it shouldn't be that. I prefer #1.
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