IPMI driver updates

Matt Domsch of Dell has been working very hard getting the IPMI driver working well on Dell machines, and I've been working on converting the IPMI driver over to use refcounts without using macros of death. This is a set of patches destined for 2.6.15, if they are ok.

Patches included are:

ipmi-use-refcounts.patch - The big one, convert over to refcounts ipmi-various-si-cleanups.patch - Lots of little cleanups from Matt ipmi-watchdog-parm-in-sysfs.patch - Parms in sysfs are nice ipmi-poweroff-cleanups.patch - Fix stupid mistakes on my part ipmi-more-dell-fixes.patch - Fixes for handling some firmware issues ipmi-si-start-transaction-hook.patch - Hooks for handling firmware bugs
and some hacks for some Dell machines.
ipmi-bt-restart-reset-fixes.patch - Fix an error recovery case in BT ipmi-kcs-error0-delay.patch - Fix an error recovery case in KCS ipmi-timer-thread.patch - A thread to make IPMI run faster on average.