local input are not to be put in accounting
new string and integer values
allow to set polipo port in orwall configuration
new constant
Allow to enable polipo connections

As pointed out by Mike Perry, Polipo (as well as all other Orbot service
ports) should be closed by default.

Thus, Polipo isn't reachable anymore.
This new option allows user to enable it back. BUT it has to be used
with caution: for now, once it's opened, any other app discovering this
port may connect and thus access to Internet (through Tor). Of course,
such vamps won't be able to do DNS queries, but it doesn't protect from
malicious outputs using IP (or embeding some resolver or host file).

Next step will be to say to what port redirect the app, thus this option
should be useless. It's just a quick workaround, and you shouldn't use
it. At all.