Modified and approved multicol-rule-large-001,
multicol-rule-large-002, multicol-rule-percent-001,
multicol-rule-samelength-001.
Added multicol-containing-002-ref.xht

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rename : contributors/opera/submitted/multicol/multicol-rule-large-ref.xht => contributors/opera/submitted/multicol/multicol-rule-large-001-ref.xht
rename : contributors/opera/submitted/multicol/multicol-rule-samelength-ref.xht => contributors/opera/submitted/multicol/multicol-rule-samelength-001-ref.xht