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as opposed to checking if a column contains an index. - Modified addIndexToTable to use the new call and report back more usefully. - Added tableContainsPrimaryKey and dropPrimaryKey, which are not actually getting used, but I could seem them being useful in the future, so checking them in. git-svn-id: https://samskivert.googlecode.com/svn/trunk@1467 6335cc39-0255-0410-8fd6-9bcaacd3b74c