Land b_release_1_4_6 onto HEAD (20060223_1455)

Land b_release_1_4_6 onto HEAD (20060223_1455)
* the b1_5_* and b_iam* branches will to continue to use the old libsysio
* until they can be updated from b1_4 liblustre because of the API change.

- API changegetdirentries->filldirentries changed from upstream
- symlink following fixup
- fix getcwd for out-of-libsysio directory
- lseek fixups for large files
- flock/fcntl fixups for 64-bit systems