fix dump I/O caused by ZYX->XYZ change
engine: make STT terms togglable
refactor Enable*Torque -> Disable*Torque
fix typo in API (Thanks Anonymous Reviewer)
revert to gnuplotting
fix vortex() giving NaN for odd number of cells (Thanks Mathias Helsen).
revert html to gnuplotting
gui: work around flacky javascript history
cli history: work around javascript history object
avoid _zero quantity to appear in gui