This fixes the setFmem function which didn't compute other related
fields after free memory change. Ideally, this should be abstracted so
that add/remove Pri and similar functions could reuse it instead of
duplicating code.

If an instance is down, it's memory is not reflected in the node used
memory, and thus the node free memory is higher than the actual value.
This patch deducts the memory for such instances from the node free
memory, allowing a correct calculation for such cases.

This patch modifies Rapi, the Cluster.loadData and hscan serialization to load
and save the instance run status. At instance level, we add both a boolean
field denoting the true/false run status, and a string field which holds the
original value (since we don't have a 1-to-1 mapping) for use in hscan
serialization.

The run status is not yet used.

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 adds a checkData function which goes over the node list and computes
the unaccounted memory, returning a list of warning messages (if any) and the
update nodes.

Nodes can have some memory unaccounted for, due to (e.g.) hypervisor
overhead, rounding errors in reporting, etc.

It is better if we model this memory explicitly instead of hiding it,
and actually since the n_mem addition it is actually required to do so.

The new attribute is not yet used.

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 Node.str function is very old and is not useful since the node
objects have much more fields today. This patch removes it, and if
needed a full node display can be done via ‘show’.

This patch adds a new n_mem field to the node objects, and implements
read/save/show support for it. The field is not currently used (except
in the node list) but will be used for checking data consistency and
instance up/down status.

This patch changes the parameters passed to the node and instance
constructors from generic Strings (which are then parsed via “read”) to
the actual used types, by converting them earlier in Cluster.loadData.

This fixes a mistake between Int/Integer. Should be more careful :)

This patch adds an hscan tool that loads data from clusters via RAPI and
writes it to files that can be later used offline.

This patch does some small changes:
  - fixes a comment
  - export more node functions (unneeded now, but hscan will use them)
  - fixes Makefile rule for building the programs

This is added for better readability, since this is very often used in
declarations.

This patch changes two things with regard to offline nodes:
  - first, it only calculates the various coefficients across online
	nodes
  - second, it adds a new score denoting the percentage of instances
	which live on such nodes

The first change allows correct score computation in presence of offline
nodes (whose properties we don't need to take into account), while the
second change actively evacuates offline nodes.

This patch adds a new ‘-’ flag for the node status which denotes offline
nodes.

This patch changes the Cluster.checkInstanceMove function to restrict
the target move list based on which nodes are online.

This patch modifies hbal (only, hn1 not yet) for setting nodes offline.

This patch adds a new node attribute - offline - which will serve to
skip nodes from the target candidate list.

This will enhance the ‘dist’ rule by skipping unneeded files.

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.

A new man page and typos fixed in hbal.1.

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 just reorders some functions for a more logical ordering.

This patch changes the solution list to include a step counter so that
it's more clear these are successive steps (in a definite order), and
not just an unordered list of changes.

This patch changes the gnt-instance failover to migrate, and fixes a bug
in the formatting of commands.

This patch added a verbose output and changed the output so that by
default it is less verbose and more clear.

This patch adds a new instance move, FailoverAndReplace, which promotes
the old secondary to primary and then uses a new secondary node.

This is the last move that we can do within the limitations of one node
changed per move.

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

This patch adds a new replace secondary and failover move (equals to
“r:x f”), which can improve the solution (since we are testing more
options at each step).

Aligned the comments in Instance.hs