[Ferm] Awesome! Plus two small patches

[Omen Wild]

I just discovered ferm and wanted to say thank you!  I love the syntax
and the flexibility.  I am in the process of migrating from my ~1,600
line shell script plus helper functions plus funky rule syntax.  ferm
is so much nicer.

I have a couple small patches.  The first allow negation to the
pkt-type argument of the pkttype module.  The second adds a built in
variable named $LINE that is the line of the current script.  I use it
like this:

@def &log($what) = {
   LOG log-prefix "rule=$what:$LINE";
}
.
.
.
&log("drop_input_pkt");

Because the way functions work this actually shows the line where &log
was called, not the line where the function is defined.

-- 
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