- Get rid of SELECT_DRIVE macro. Start to move all direct hardware access
   functions in to one place.

 - Get rid of SELECT_MASK macro. Realize that the mask is always equal 0.
   Simplify the maskproc therefore.

 - Get rid of GET_STAT and OK_STAT macros as well.

 - hpt366 cleanups by Andrej Panin.

 - Artop driver update by Franz Sirl.