NASL2 new operators & precedence

I add three new operators:
**  is the integer power (Fortran syntax)
^   is the logical xor
>>> is the unsigned / logical right shift (Java syntax)
>>  is now the signed right shift
(and by the way, there is no such thing as singed / unsigned left
shift :)
I also added %= which was missing

Here is the precedence I implemented now (from lower priority to
higher):
%right = += -= *= /= %= <<= >>= >>>=
%left ||
%left &&
%nonassoc < > == != >= <= ><
%left |
%left ^
%left &
%nonassoc >> >>> <<
%left + -
%left * / %
%left - (unary minus) ~
%right **
%nonassoc ++ --


I know that this precedence is not like 
- C; but C precedence really sucks
- Java; but you cannot imagine how much I hate this language and the
  marketing s** around it
- Perl; but so many Perl operators are missing (and, or, etc.)

%nonassoc means that those constructions are rejected:
x << y << z
++ x ++ 
x ++ ++
x > y > z
"a" >< str >< "b"

%right means that 2**3**2 is parsed as 2**(3**2) = 2**9 and not
(2**3)**2 = 8**2

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