multiple subdevice commands

I've made some changes to cvs, so now every subdevice that supports 
commands produces a device file (using udev) called /dev/comediX_subdY 
corresponding to subdevice Y on board X.  This will allow a driver to 
support read or write commands on multiple subdevices.  There are new 
subdevice flags SUBD_CMD_READ and SUBD_CMD_WRITE to indicate the direction 
a subdevice supports commands in.  All the drivers have been updated with 
the new subdevice flags.  I also broke compilation on 2.4 kernels.

-- 
Frank