[FIX] articles: Close form properly on submissions page and exclude the topic column from duplicate detection

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48053 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] articles: jQuery behaviour change broke rowSelector, now needs the container to be specified (defaults to table:first)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48054 b456876b-0849-0410-b77d-98878d47e9d5