Online device removal pushed to the unstable trees

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Hello everyone,

I've pushed out some code to remove devices online.  There are no disk format 
changes included.  The basic usage is to:

mkfs.btrfs /dev/sdb /dev/sdc /dev/sdd /dev/sde
# mount, do things

btrfs-vol -r /dev/sdc /mnt

Any blocks on /dev/sdc will be relocated to other chunks.  The algorithm is 
very simple but it works for all the raid levels.  A future project will be 
to optimize this code for drive replacement.

There are also fixes in there for the code that does mount -o subvol=<name>

Next on my list is the ability to mount a degraded filesystem.

-chris



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