A few comments about new plotting options.
* rem_plot_option: let's spell out "remove".
* gnuplot_prefix / gnuplot_preamble: I gather that these two are the
same. I'm implacably opposed to aliases, as they are nothing but a
source of trouble. Let's nuke one or the other, I don't care which.
* samexy, samexyz, yxratio, maybe others: can we write these with an
underscore to separate distinct semantic bits, e.g., same_xy,
same_xyz, yx_ratio. Especially for speakers of languages other than
English, it is hard to see where to break the semantic units (but
it's hard enough for native speakers too).
FWIW
Robert Dodier