Update of the Prosum driver

[Vincent Jardin]

I have merged the Proatm driver with my local copy.

It is available at:
http://vjardin.free.fr/harp/harp_20030613.tgz

* pci/proatm.[ch], pci/proatm_rtbl.h:
  - Merge with the release of Christian Bucari (1.0050) who has
  replaced all the u_char, u_long, int, ... with u_int8_t,
  u_int32_t, int32_t, ...
  The diff with the Prosum's release is:
    - Sanity check of M_PKTHDR.
    - Missing splx.
    - Fix a panic when there is a null-length buffer.
    - Support 2 PCI boards that share the same IRQ.

Vincent