OpenPIC interface rewrite

OK,

here we go.
This is tested on my EPCI based board and I have attached the
setup file for that one as an example.
I have NOT touched the other ports AND the interface
is bacwards incompatible, so I hope all of you porting
people can do that yourself, shouldn't be too difficult.

All the chrp specials can now be implemented through the
new interface wo. any special stuff. Just make a one-line
function accessing the "special" ACK-address and point the
cascade entry to that, And the programming switch priority
can be set higher directly in the definition table.

In hope of good comments and thorough testing...
Special attention should be put at the stuff I could not
test here ie.
IPI-stuff and timers

BRGDS

Dag Nygren