This prints the total memory/disk and also adds a header.

This is to keep in style with the other memory variables.

This is useful and not easy to compute otherwise.

This patch adds the node attribute “reserved memory percentage” that is
derived from the maximum reserved memory for a node and its total
memory.

This will be useful for enhancing the balancing algorithm.

This patch removes the primary/secondary instance lists from the node
status and also removes the tabbed formatting with explicit width
formatting.

Currently, we fail a new instance placement if the new node status is
not N+1 compliant. This means that an allocation on an already N+1
failed node still fails, even though (conceptually) we're not worse than
before.

This patch changes this model to fail the allocation *only* if the node
was N+1 compliant before. This allows balancing to work on non-N+1 happy
clusters, with the caveat that they probably won't be N+1 happy at the
end.

Since we skip N+1 check in some cases, we add a new “failHealth” check
that verifies the node still has strict positive free memory and disk
space.

This patch adds a '*' character to nodes which are not N+1 compliant to
the output, to help with understanding pre- and post-changes cluster
status.

Since we only use the totals for computations, and we always convert
them via fromIntegral, let's just store them directly as Doubles.

This just makes indendation nicer in many expressions.

This patch changes the computation of p_mem / p_dsk from on-demand
(whenever the cluster stats are computed) to after-modify (after a node
is modified, we update its stats). This brings a god speed-up as only
one node or two are usually changed between cluster-wide stats are
computed.

This patch changes the format of the input node and instance lists. It
removes the list of primary and secondary instances from the nodes, and
adds the primary and secondary nodes to the instance list.

This is done so that we can have the same input data from commands as
from the RAPI.

This is the initial import of release 0.0.3.