New psql startup banner

psql now shows new text on startup.  The old one just looked bad.
Hope the psql upgrader can merge these changes in. I know we weren't
supposed to touch psql, but I suspect he is not touching the banner.

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OLD:

Welcome to the POSTGRESQL interactive sql monitor:Please read the file COPYRIGHT for copyright terms of POSTGRESQL

NEW:

Welcome to the PostgreSQL interactive terminal.
(Please read the copyright file for legal issues.)


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