My gosh, where to begin.
 * databox: fixed data loading so it supports one column, along with a few minor behavior fixes
 * fitter: set the default marker in fitter() to "+" for easier viewing / faster plotting (can still set this to 'o' by modifying 'style_data' parameter
 * fitter: added xlabel and ylabel option, fixed some of the ambiguity in setting y-errors automatically
 * fitter: added "set_guess_to_fit()" function to copy the fit parameters into the guess.
 * fitter: added xscale and yscale options for data better displayed on log scales (uses numpy.logscale) for the curve x data)