Add missing rsync dependency dependency in the install section of
the documentation

 * Add instuctions for installing the software in Ubuntu 12.10
 * Rephrase some parts in install, overview and usage sections

Support both versions (1.2.x and 2.x) of python-sendfile. In
v1.2.x (py-sendfile) the returning value of the sendfile function is a
tuple, where in v2.x (pysendfile) it's a simple integer.

Make them comply with current source tree

If the process takes too long to finish after the stdout fd is
closed, kill it.

The cow file when creating images or the temporary image file when
bundling the host system may be large. Allow the user to overwrite
the directory under which those files get created.

In the "Installation from source" scenario, add python-sendfile to the
list of dependecies that will be installed via apt-get. Else, it would
complain about missing C headers and the user would need to download
python-dev instead.

When cleaning up sensive user data on unix systems, remove .kamakirc
and .kamaki.history too.

Handle correct extended partitions with id 0xf

Make sure the user cannot select a directory as input media

Add options for preserving extended atrributes, hard links, ACLs.

 * Fix a bug where the parent process did not wait on the child
   processes.
 * Make sure that when updating the copy progress bar, at least
   0.1 seconds have passed. This guarantees that we do not experience
   any flickering in the progress bar.

Add a new try_fail_repeat function that wraps cleanup system commands
and retries them if they fail. There are cases where commands like
dmsetup, umount and losetup -d may fail with device is busy. In most
of the cases, sleeping for halve a second and retrying does the job.

In Guestfs you get notifications about progress on some functions like
launch() by registring callback functions. When using guestfs from python,
this is fragile. If the callback functions raises an exception, you end up
with segmentation fault. It is better to completely remove the progress
monitoring from launch().

Replace the UUID entries in fstab and grub files for filesystems that
have beeen recreated.

The exclude patterns should contain relative to the source paths