KDL orbit update
ditch vsmooth, add more lines.  orbit pv with more lines, more figures.
added molecular cubes path
two more lines
added a piecewise-temperature-cube-maker... which works but not well
enough
store ratio cubes in their own file for importing.
Deprecate `make_temperature_cube` - too noisy, not enough useful pixels
try to store dendrogram-sectioned temperature derivations back in the
parent cube
add note about what the dendro-tem cube includes