Improve Private Storage detection. MCabber now correctly detects Private Storage support when receiving an item-not-found error (which doesn't mean the server has no support for P.S., but that it's empty). I've added a return value to the callback functions. For now the return value is only used for IQ error handling.

#! /bin/sh

set -e -x

asciidoc -b css -d manpage mcabber.1.txt
asciidoc -b docbook -d manpage mcabber.1.txt
mv mcabber.1 mcabber.1.before
xmlto man mcabber.1.xml
mv mcabber.1 mcabber.1.new
mv mcabber.1.before mcabber.1