Changes
Some obs, and removal of non explained "Efficient container creation" (please explain better)
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* File system journal is not bottleneck anymore[if you are not using journal_async_commit mount option yet]
* Large-size image files I/O instead of lots of small-size files I/O on management operations
* Disk space quota can be implemented based on virtual device sizes; no need for per-directory quotas
* Number of inodes doesn't have to be limited because this is not a shared resource anymore (each CT has its own file system)[but these file systems yet have their own inodes limit]
* Live backup is easy and consistent
* Live migration is reliable and efficient
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In addition:
* [Potential] support for QCOW2 and other image formats
* Support for different storage types
