slugos: new ethernet driver, ixp4xx release 2.1, ethernet 1.5 (all slugos distros)

slugos: new ethernet driver, ixp4xx release 2.1, ethernet 1.5 (all slugos distros)
  - Release 1.5 of the ethernet driver is compatible (almost) with Linux
  - kernel version 2.6, consequently it has been possible to remove a very
  - large number of the previous patches.
  - Release 2.1 of ixp4xx-csr is substantially unchanged from the point
  - of view of kernel 2.6 compatibility, however it has extra functionality
  - which is used by v1.5 of the ethernet driver.
  - It is essential to either use 2.0/1.4 or 2.1/1.5 - the releases cannot
  - be mixed.