- separate all EXPORT_SYMBOL stuff to saa7146_ksyms.c
 - properly stop capturing when no more buffers are available (missing
   register upload)
 - make extension data a per-device member, not a per-extension member,
   so that every device can have it's own private data (necessary for
   DVB drivers which handle more than one device)
 - implement field based capturing, ie.  capturing fields to different
   capture buffers
 - change default old of capture fields for ALTERNATE mode (comply with
   bttv)
 - follow these changes in various analog saa7146 based cards drivers
   (mxb.c and dpc7146.c)
 - follow these changes in various saa7146 based budget card drivers