Plot (Big)

Now manages its memory better when figures or axes are reused (with thanks to Jack).

Added support for the new graphics system in R2014b.

Added ability to have multiple LinePlotReducers in a single axes object. Note: this is for convenience; it's fastest to use a single LinePlotReducer for all lines in the axes.

Now allows inputs as combination of rows and columns, like the built-in plot functions. For instance, these all do the same thing:

x = 1:10;
y = [1:10; 2:11];
reduce_plot(x, y);
reduce_plot(x.', y);
reduce_plot(x, y.');
reduce_plot(x.', y.');

Fixed a bug when "taking over" a plot with only a single line. Fixed a bug that caused the final line spec in a series to be ignored.