updating section kwargs
moving some vars to different sections
updating argparser arguments
updating command line overrides
fix var names in savefig method
adding textlog_format to datasets ssections
cleaning up whitespace
adding fileformat property to DataSet class
removing textlog_format option and adding fileformat option
update code to parse textlog data files
fix bug where xscale_factor was yscale_factor
append fname_sufix to output_fname if given
updating plot method to parse textlog xdata/ydata.
adding nrows/ncols arguments to argparsers
adding nrows/ncols options and renaming rows/cols to row/col in dataset options.
adding code to print out extra_values in input configfile
renaming fileformat to dataformat
renaming fileformat to dataformat
moving code to parse xdata/ydata attributes from XYPlot class to PlotConfigParser class
further refinements to xyplot cfgspec