all: significant overhaul by Peter to avoid problems with OBD metadata

all: significant overhaul by Peter to avoid problems with OBD metadata
	conflicting with ext2 block data in the inode.
class/obdcontrol: added proper commands for snapdelete/snaprestore
class/obdcontrol: device command now disconnects old session if any
ext2obd/*: updated for kernel 2.3.30
include/linux/obd_class.h: helper functions inode metadata cpy/cmp
include/linux/obd_snap.h: new magic less likely for block conflict
	now that the redirector can have "i_blocks" set
obd/obdfs: updated for kernel 2.3.30
snap/snap.c: use new obd metadata copy helper routines
snap/snap.c: updated delete/restore snapshot iterator functions