swab and ufs Fixes

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I've hacked together a cleanup version of the ufs fs driver.

1. it includes a neat clean-up of linux/include/*/byteorder.h for all architectures (from 2.0.29 sources), where all portable/common definitions are in , while swab__uXX macros are defined for use in various byteswapping drivers

2. it works on both 2.1 and 2.0 kernels

3. it replaces the old non-working driver from 2.0 with working 2.1 sources

4. it is a clean-up with respect to ufs sources (the horrible bugprone global ufs_need_swab removed, many small things)

5. it removes a dangerous bug in 2.1 ufs driver where mounting partitions of different bytesexes would result in mayhem.

6. I think ufs was not upgraded since the 2.1.20 sources I used; if it was, please tell me.

   Because it's essentially a clean-up, this package *should not* have broken anything. If it did, please tell me! I tested it ok on a 1GB worth of data from a Sun on an PC.

   Please send feedback/comments by e-mail, as I've BTW: how do I know if this patch will make it to official distribution?