First tested full-featured release of ncvue

First full-featured release of ncvue, a minimal GUI for a quick view of netCDF files. It is aiming to be a drop-in replacement for ncview, being slightly more general than ncview, which targets maps. If ncvue is used with maps, it supports mostly structured grids, more precisely the grids supported by cartopy.

This release features three panels, that means three different plotting styles: Scatter/Line plots, Contour Plots, and Maps.
It includes tooltips on buttons, sliders, entry boxes, spinboxes, and menus. Graphical documentation exists on Github Pages.