[thin_check] we don't need to import the persistent_data namespace any more.
[thin_rmap] Stub
update ignore file
[thin_check] fluff
[thin_rmap] region parsing
[btree_damage_visitor] Make sure the path for a value includes it's key.
[unit-tests] remove thin_metadata_t (wasn't testing much, and is now broken)
[thin_rmap] finish implementing