b=7085

 - port old fixes from b1_4 to HEAD (extents related)
 - unify extents & fsfilt codebase with fsfilt

 - make extents,mballoc a default options for OST

 - reservation feature in ext3 hurts test #3: disable it

r:alex
add lookup-raw patches for raw lookup acceptance tests

 - clean more files at clean time

some patches fix for lustre in FC3

- b1_4 is basically the parent of HEAD, because that's the direction
  that changes flow, as strange as that sounds.  so there's a
  HEAD_BASE tag which sits on b1_4

b_cmobd_merge should not be used for any further development or testing!

cMD_PRE_CMD_SMASH are the relevant tags.

The pre-smashing contents of HEAD will be committed by yury into b_cmd as a
merge of the two branches.  These will be stabilized on b_cmd and eventually
landed onto HEAD.

b=2094, b=3138, b=3335, b=3274, b=3293, b=2862, b=3147, b=2350, b=3313
b=3265, b=3315, b=3301, b=3325, b=3329, b=3125, b=3098

b=3043, b=3258, b=3219, b=2410

b=2912/2922, b=3145 too

b=3116, b=3064, b=3107, b=3122, b=1519, 2.6 kernel fixes, group lock fixes

b=3057, 2947, 2925, 3050, 3041, 2849, 1662