R-beta: Precedence of ~ and |

[Ross Ihaka]

I noticed this when I wrote a coplot gizmo and had to change the
precedence.  The new precedence list is

	%left           '?'
	%left           LOW WHILE FOR REPEAT
	%right          IF
	%left           ELSE
	%right          LEFT_ASSIGN
	%left           RIGHT_ASSIGN
	%nonassoc       '~' TILDE
	%left           OR AND
	%left           UNOT NOT
	%nonassoc       GT GE LT LE EQ NE
	%left           '+' '-'
	%left           '*' '/' '%'
	%left           SPECIAL
	%left           ':'
	%left           UMINUS UPLUS
	%right          '^'
	%left           '$'
	%nonassoc       '(' '[' LBB

It has also been pointed out to me (by the compiler division) that
AND and OR should have different precedences.  My C manual says
&& has higher precedence than || so I will make this change too.
	Ross
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