#1 Add baltic charset support

[Rimas Kudelis]

This patch adds Baltic (ISO 8859-13) to the list of available
charsets.

It also renames "Unicode" to "Unicode (UTF-8)", because the
definition of "Unicode" in windows is different from "Unicode"
in MacOS which again is different from "Unicode" in BeOS. If
you don't like this, you may simply edit the respective line
of the patch.

[Rimas Kudelis]

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Seems like I cannot upload the patch (Netpositive suxx). So, i've
put it to http://rq.shacknet.nu/BeOS/Vision%20IRC%20with%20ISO-8859-
13%20support/vision.diff. Please get it from there (before my server
dies for unknown reason :D) or ask me to mail it to you...