Adds legend to map trace colours to filename when plotting multiple files
(plot.py)
Fixes implementation of -normalise in plot.py
Updates plot.py to append flags to indicate if the plot has been normalised
and whether y[0] or x[0] was subtracted.
Comments out code in plot.py that does not currently work and leads to
extended run time on OS X
Adds -sub_x0 option to plot.py
Fixes implementation of -normalise in plot.py
Adds new -grid to plot.py
REALLY adds -sub_x0 to plot.py
Adds new column_headers property to CSVReader
Adds warning on use of headers property, comments out debugging output about
loading SIOS data (CSVReader)
Updates stats.py to use new column_headers property of CSVReader when printing
out y-series stats