- elimininate the system calls from filter obd

- elimininate the system calls from filter obd
- use module_init macros not old style init_module functions
- remove unused crud from lustre_light.h use the good stuff more
- move directory readpage operations to dir.c
- cleanup rw.c significantly; it's actually understandable now.
- attribute handling: indicate to setattr to call truncate on OBD or not
- add osc destroy
- fix mds_reint_unlink (checked mode wrongly)
- add ll_delete_inode (to also go to the OST to remove data object)
- add truncate.c test program to tests
- avoid using ambigous READ/WRITE constants