Modified and approved multicol-gap-fraction-001,
multicol-gap-large-001, multicol-gap-large-002,
multicol-gap-negative-001.
Added multicol-gap-large-002-ref

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rename : contributors/opera/submitted/multicol/multicol-gap-fraction-ref.xht => contributors/opera/submitted/multicol/multicol-gap-fraction-001-ref.xht
rename : contributors/opera/submitted/multicol/multicol-gap-large-ref.xht => contributors/opera/submitted/multicol/multicol-gap-large-001-ref.xht