View FILE in View mode in another frame.
When done, kill the buffer visiting FILE if unmodified and if it wasn't
visited before; also, maybe delete other frame and/or return to previous
buffer.
Emacs commands editing the buffer contents are not available; instead,
a special set of commands (mostly letters and punctuation)
are defined for moving around in the buffer.
Space scrolls forward, Delete scrolls backward.
For a list of all View commands, type H or h while viewing.
This command runs the normal hook `view-mode-hook'.