It has been far too long since the last IPMI driver updates, but now all 
the planets have aligned and all the pieces I needed are in and all seem 
to be working.  This update is coming as four parts that must be applied 
in order, but the later parts do not have to be applied for the former 
parts to work.

This second part adds the "System Interface" driver.  The previous 
driver for system interfaces only supported the KCS interface, this 
driver supports all system interfaces defined in the IPMI standard.  It 
also does a much better job of handling ACPI and SMBIOS tables for 
detecting IPMI system interfaces.

FYI, IPMI is a standard for monitoring and maintaining a system.  It 
provides interfaces for detecting sensors (voltage, temperature, etc.) 
in the system and monitoring those sensors.  Many systems have extended 
capabilities that allow IPMI to control the system, doing things like 
lighting leds and controlling hot-swap.  This driver allows access to 
the IPMI system.

-Corey