Modified and approved multicol-span-all-001, multicol-span-all-002,
multicol-span-all-child-001, multicol-span-all-child-002,
multicol-span-all-margin-001, multicol-span-all-margin-002.

Added correspondent associated reftests.

--HG--
rename : contributors/opera/submitted/multicol/multicol-span-all-2-ref.xht => contributors/opera/submitted/multicol/multicol-span-all-002-ref.xht
rename : contributors/opera/submitted/multicol/multicol-span-all-child-ref.xht => contributors/opera/submitted/multicol/multicol-span-all-child-001-ref.xht
rename : contributors/opera/submitted/multicol/multicol-span-all-child-2-ref.xht => contributors/opera/submitted/multicol/multicol-span-all-child-002-ref.xht
rename : contributors/opera/submitted/multicol/multicol-span-all-margin-2-ref.xht => contributors/opera/submitted/multicol/multicol-span-all-margin-002-ref.xht