#28 svn service (subversion svnserve)

[Wesley J. Landaker]

The open-source version control system Subversion
<http://subversion.tigris.org> has an IANA assigned service
called "svn". It would be great if Firehol could support this
natively.

Basically, it just needs to be:

server_svn_ports="tcp/3690 udp/3690"
client_svn_ports="default"

Very easy for a user to add, sure, but since it's an IANA service
and a pretty high-profile open source project, it seems like firehol
would benefit from supporting this out of the box. =)