full identification of an Info page

[Dan Jacobson]

Gentlemen, today we shall discuss
Info-current-file, Info-current-node, Info-current-subfile.
Let's say I wish to make a public criticism of a certain Info page.
Well, none of these variables alone holds a good enough description of
which page I'm talking about. It's like I'll only tell you is the first
half or last half of my address, but not the whole address.  Therefore
there should be a way to get the whole shebazz in one scoop.  And no,
don't go telling the user to go make his own function to do that.