Keyword Passing in Plotting Code

[mwilensky768]

Each plotting function in plot_lib calls some axes method such as "errorbar" or "set_%s" % attr such as "set_xticklabels." Since this is just plotting code, rather than having keyword arguments for a subset of the attributes that can be set, there can be one plotting function which then takes two pair sequences, where one sequence describes the plotting method kwargs, and another describes the axes attributes to be set. Since this is using implicit keywords, useful settings can be shown in the documentation.

[mwilensky768]

This will break some scripts, which are not covered by unit tests.