performance charts: change the branch order; improve chart formatting
performance charts: change the branch order; improve chart formatting

deerwalk/voltdb,migue/voltdb,kumarrus/voltdb,zuowang/voltdb,creative-quant/voltdb,creative-quant/voltdb,paulmartel/voltdb,creative-quant/voltdb,migue/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,flybird119/voltdb,deerwalk/voltdb,VoltDB/voltdb,creative-quant/voltdb,zuowang/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,wolffcm/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,kumarrus/voltdb,paulmartel/voltdb,flybird119/voltdb,ingted/voltdb,wolffcm/voltdb,deerwalk/voltdb,ingted/voltdb,zuowang/voltdb,creative-quant/voltdb,deerwalk/voltdb,deerwalk/voltdb,ingted/voltdb,ingted/voltdb,flybird119/voltdb,wolffcm/voltdb,kumarrus/voltdb,migue/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,migue/voltdb,VoltDB/voltdb,VoltDB/voltdb,paulmartel/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,paulmartel/voltdb,ingted/voltdb,migue/voltdb,zuowang/voltdb,paulmartel/voltdb,VoltDB/voltdb,ingted/voltdb,creative-quant/voltdb,flybird119/voltdb,kumarrus/voltdb,creative-quant/voltdb,creative-quant/voltdb,migue/voltdb,paulmartel/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,zuowang/voltdb,zuowang/voltdb,VoltDB/voltdb,deerwalk/voltdb,wolffcm/voltdb,VoltDB/voltdb,wolffcm/voltdb,VoltDB/voltdb,deerwalk/voltdb,flybird119/voltdb,wolffcm/voltdb,zuowang/voltdb,flybird119/voltdb,deerwalk/voltdb,migue/voltdb,migue/voltdb,flybird119/voltdb,ingted/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,ingted/voltdb,paulmartel/voltdb,zuowang/voltdb,flybird119/voltdb