don't extend basis.data.AbstractDataset by getIndex/deleteIndex
don't extend basis.data.AbstractDataset by getIndex/deleteIndex

basisjs/basisjs,fateevv/basisjs,smelukov/basisjs,fateevv/basisjs,tyanas/basisjs,istrel/basisjs,smelukov/basisjs,istrel/basisjs,basisjs/basisjs,basisjs/basisjs,tyanas/basisjs,smelukov/basisjs,fateevv/basisjs,istrel/basisjs,tyanas/basisjs