TODO/bugs in Irssi SILC client
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+ o /USERS does not show the user modes on the channel correctly.
+
o Fix the silc_channels_join to parse the command like, with fe.
silc_parse_command_line, because currently it ignores all options,
including passphrase which makes autojoin impossible to +a channels.
keys is not possible because changing the key is not possible by the
user.
+ o Add the server/router operator info to the statusbar.
+
o /cumode for unknown nick does not give any error message.