tplot_math.tinterp is adding the whole data structure to tplot_names()

[ilgingell]

Lines 35 and 42 both add new_tvar2 to the name attribute of the tplot variable with these two lines:

pytplot.data_quants[tvar2].name = new_tvar2
pytplot.data_quants[tvar1 + '_tinterp'].name = new_tvar2

but new_tvar2 is the whole structure with name, attributes, and the data quantities. So it ends up putting xarrays into the list of tplot_names which breaks a few other bits and pieces.

This seemed to fix it, though I don't know if its the best way:

pytplot.data_quants[tvar2].name = copy.deepcopy(new_tvar2.name)
pytplot.data_quants[tvar1 + '_tinterp'].name = copy.deepcopy(new_tvar2.name)

[MAVENSDC]

Thanks for catching that! The latest version should fix it.