[development] load node globally

[Nathaniel Catchpole]

In HEAD node_load() is done about 13 times during the course of a node/n
page load - but as already mentioned, the static cache in node_load()
prevents duplicate queries in those cases, or if it's called again from a
theme.

In Drupal 7, node_load_multiple() will let you pull all nodes on a page in a
single query (+ 1 per hook) for node listings, and there's an active patch
to cache fully loaded node objects persistently (i.e. in a cache_node table,
or memcache) here: http://drupal.org/node/111127  which could use some extra
benchmarks if anyone wants to help it get in.

Nat
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