This patch adds support for selecting the instance/node file names via
two environment variables (HTOOLS_NODES, HTOOLS_INSTANCES).

Unfortunately we still have lots of duplicated code, since the options
are not unified.

Neither hbal nor hn1 take any arguments beside the options, so if any
are passed is most likely an unintended error. This patch aborts in such
cases.

This patch adds checking of cluster data in the binaries and display of
node's x_mem/i_mem in the node list.

This patch moves the common CLI functionality (as much as currently
possible) into a separate module. This means we only have one parseOpts
and that Utils.hs doesn't keep this kind of functions anymore.

The modules are moved from the ‘top’ namespace to ‘Ganeti.HTools’, in
compliance with standard practices.

This patch moves the version string creation into a function in Utils
which shows some more information.

This patch adds a -V, --version command line option that shows the
program version and also updates the hn1 usage string (similar to hbal).

This patch moves the formatting of the command list to Cluster.hs and
enhances it with separator messages between the steps.

This patch adds printing the initial and final cluster coefficients in
hn1 too, to better understand the found solution.

This patch automatically removes the longest common (domain, i.e.
starting with a dot) suffix from the node and instance names. This gives
a much clearer display, and this format is compatible with the way
Ganeti accepts shortened names.

This patch moves a function to Utils and changes hn1 to be able to take
data from RAPI.

This is the initial import of release 0.0.3.