PR# 10828 Extra parentheses around operator feature call that was identifier call in ancestor

You already know about this, but I wanted to put it in the
list so it might eventually be fixed.  A call to an 
operator feature that was a call to an identifier feature
in the ancestor class has an extra set of parentheses
around it that should not be there.  See flat form of
feature `infix "@hamster"' in class TEST after compiling
with attached classes.

With current implementation, this is not easy to fix. Since a call implies the top precedence. Parentheses are needed when you have something like this in TEST1:
	infix "@wimp", hamster (n: INTEGER): TEST1 is
		do
			print (@weasel Current);
			print (turkey);
			print (Current @wimp 29);
			print (hamster (47).hamster (47));
		end

without parentheses, the flat view will look like:
	infix "@hamster" (n: INTEGER_32): TEST1
			-- (from TEST1)
		do
			print (Current.weasel)
			print (@turkey Current)
			print (Current.wimp (29))
			print (Current @hamster (47).hamster (47))
		end

The last line is not valid code. Now suspend until we have a better solution.

Attachments for problem report #10828