2 suggested INFO changes.

[Ethan Bradford <BRADFORD@SU-SIERRA.ARPA>]

I suggest that we make ^X I and ^_ I go directly to the EMACS node in
the info tree instead of to the DIR node.  This would be much less
confusing for EMACS users who are new to INFO.

Also, it would be nice for U to be made synonomous with L for nodes
which have no UP (which is mostly un-infoized files).  In most cases
that would do the right thing and it would be easier on those people
who first learn only the M and U info commands.

Anybody have any strong opinions on this either way?

-- Ethan
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