Improved behaviour of format_cmdline_uri for preprocessing SIP URIs given on the commandline

darcs-hash:20090115170805-58103-2bf000e8eff32e72672ad02f1da2b6a0540b472c
Made sip_register's return code based on registration status

darcs-hash:20090115105045-1e3d8-b90ec898664860e11d31266f6b348589c3b3b801