Help scan mode quick introduction.

	Help scan mode can be reached from almost anywhere in strn by
typing 'H'.  (It will even work in the middle of paging an article.)

	Use the arrow keys or the 'n' (next) and 'p' (previous) keys
to move around the list of help entries.  Type the SPACE bar or RETURN
key to read a "help" file or enter a "topic".  Type 'q' (quit) to go
back to a previous topic or to exit the help scan mode from the "Top Level".

Type 'h' while in help scan for a full list of commands.
