[wmii] wmii-3.1 patch: send from floating area to any area

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Hello,

In wmii-3.1 you can send a client (1) between any non-floating
areas, and (2) from a non-floating area to the floating area. But
you cannot send a client from the floating area to any other area.

So, here is a patch which enables you to send a client from any area
to any other area (via "sendto AREA_NUMBER"). This patch also
includes the sendto segfault fix, which I posted recently.

Cheers.

By the way, it is faster to send a client to a particular column via
"sendto AREA_NUMBER" than iteratively via "sendto next|prev".
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