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GHC 6.12 has some new warnings, which are valid in most cases except
(IMHO) printf usage.

This updates the movable flag on instances if they have only one node
(we don't rely on OpMoveInstance) or if they are set so via the command
line options.

This doesn't yet enable the use of the new flag.

This patch changes from the two separate files to a single file, with
sections separated by a blank line. Currently only the node and instance
data is accepted, later the cluster tags will be read too via this
format.

This makes all the programs accept the new format, but hscan doesn't yet
generate it.

While these are not actually populated from the backends, and all the
programs ignore them, this patch contains the changes in the function
types required.

Since we don't want all instance tags to be used for exclusion, we add a
command line option to filter on these. Since the iallocator protocol
cannot accept command line options, currently it's not possible to
specify these for hail, and thus it will never use any exclusion tags.

This patch adds loading and processing the utilisation data during
instance moves. While the data is not yet used, it is correctly modified
by instance changes between nodes.

hbal has the new ‘-U’ command line argument for this. The format of the
file is simply instance name and the four stats, space-separated.

Due to the Control.Exception changes between 6.8 and 6.10, using it
portably is difficult. Since we're only interested in handling I/O
errors, we can use prelude's catch and not have to deal with
Control.Exception at all.

The use in Luxi.hs where we just use bracket is fine across the two
versions, so we keep that.

Haddock doesn't like pre-processed files (at least not in all versions).
Thus we need to remove the ExtLoader module from the haddock-procesed
file list.

Since curl is not always needed (e.g. when only using luxi or less
likely file backends only) and is also not always available, it is
useful for building without it. This of course disabled the RAPI
backend.

This patch changes ExtLoader to build with the ‘-cpp’ option which makes
ghc run it through cpp first; and based on whether ‘NO_CURL’ is defined
or not, this toggles RAPI/curl inclusion. The patch also removes the
import of Rapi in QC.hs since it's not actually used in tests.

Invoking make as ‘make HEXTRA=-DNO_CURL’ is enough to trigger the new
build mode.

Currently the external data loader is in CLI.hs, which makes all
programs that need cli functionality (options, etc.) link against the
network modules (most importantly curl). This patch splits this
functionality into a new module such that (for example) hail which only
deals with file I/O doesn't link against these libraries.