HEADSUP: ath updates

I just committed updates for the ath driver and the ath hal.  There are many 
changes to this code including a split of the tx rate control algorithm into 
a separate module.  This means that when statically configuring the driver 
you now need to specify:

device	ath
device	ath_hal
device	ath_rate_onoe

to get the previous functionality (i.e. the previous rate control algorithm).  
There is a second rate control algorithm that is slightly different from the 
onoe algorithm; you can try that with

device	ath_rate_amrr

However both of these algorithms are still rather lame and a good algorithm is 
needed.  I encourage folks to step up and work on this as a good tx rate 
control algorithm makes all the difference.

The new hal should support all shipping Atheros parts.  Operation should be 
noticeably better and the driver supports all the functionality of the 
revised net80211 layer.  This includes the security protocols (WPA, 802.11i, 
802.1x), the QoS/Multi-media protocols (WME/WMM), and more.

One problem to beware of is that WME and WPA currently do not work together 
(for AP operation at least).  If you want to test out WPA be sure to disable 
wme--this will require the new ifconfig that I'll be committing shortly.

There's still a bunch of work to do on the driver.  I'll be working fulltime 
on this stuff for the next few months; mainly on AP support.

	Sam