Gnuplotlib

* I "unset multiplot" after sending multiplot data

-- Dima Kogan <dkogandebian.org> Sat, 23 Dec 2023 12:24:59 -0800

* gnuplotlib works with subclasses of np.ndarray
* minor improvements to error-handling logic

-- Dima Kogan <dkogandebian.org> Mon, 19 Jun 2023 16:41:33 -0700

* Added 'cblegend' plot option

-- Dima Kogan <dkogandebian.org> Sat, 14 Jan 2023 23:08:35 -0800

* Extended add_plot_option() API

This is a backwards-compatible update. There is NO API break. Two new
features:

- multiple key/value sets can be set in a single call by using keyword
arguments

- "overwrite" kwarg can be used to overwrite previously-set keys OR to
leave the previous ones without barfing

-- Dima Kogan <dkogandebian.org> Sun, 11 Apr 2021 18:42:07 -0700

* Updated default hardcopy settings

-- Dima Kogan <dkogandebian.org> Wed, 03 Feb 2021 14:31:33 -0800

* add_plot_option() API change: takes single options as scalars and
lists as lists, just like the plot options that accept multiple values

-- Dima Kogan <dkogandebian.org> Fri, 13 Nov 2020 21:28:55 -0800