[RFE] use row index in plots

Hi,

I've just tried nPlot for the first time -- I'm looking for a viable quick'n'dirty alternative to gnuplot for small and large datasets. An immediate shortcoming (for me) was that I could not use the row index as basis on the X axis.

As I usually plot timeseries data (e.g. vmstat output) this is a must for me. I'm guessing other people would welcome it too.

cheers,
Andras