Unary % operator is broken in current sources

These used to work:

regression=> select %f.f1 FROM FLOAT8_TBL f;
ERROR: parser: parse error at or near "%"
regression=> select f.f1 % FROM FLOAT8_TBL f;
ERROR: parser: parse error at or near "from"

This is causing the float8 regress test to fail.

I suspect this has to do with Bruce's recent hacking on operator
associativity.

regards, tom lane