fix for SELECT 1; SELECT 2 fails when sent not via psql, semicolon problem

I have fixed:
SELECT 1; SELECT 2 fails when sent not via psql, semicolon problem

Our grammer was way too overly complex in this area, and is much
clearer, with no shift/reduce conflicts.  To test, run postgres from the
command line.  psql already breaks up the commands.

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