lastlog - add -output option

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What:
/lastlog, once this patch is applied, accepts a new parameter, -output
<refnum|window>.  This lets you set where lastlog should place the
output (if not the current window).  This output also works with -clear,
clearing the selected window of any lastlog output.

Why:
Ok, this was discussed in #irssi on freenode for a bit.  I obviously use
lastlog strangely, but I like having lastlog results in a seperate
"logs" window.  This is so I can keep reading the current channel, while
still checking through a lastlog.  Rather than having to switch to a new
channel and running lastlog, I wrote this patch.

Patch is attached, or can also be retrieved from
http://www.strudel-hound.com/irssi-lastlog-output.patch

Signed-off-by: William Pettersson <[email protected]>
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