`cctk.quasiclassical` rotation is broken

[corinwagen]

Not sure why, but I get insane velocities when I set do_rotation to True in cctk.quasiclassical.get_quasiclassical_perturbation.

For instance, here's the velocities I get from running a 300 K quasiclassical initialization on test/static/methane_hpmodes.out:

[[  0.05273943  -0.06015768   0.08881368]
 [-10.454403     6.928813     3.9630766 ]
 [-22.108727    18.917265    -4.42791   ]
 [ 21.231005    -7.157976   -28.53397   ]
 [ 10.807802   -17.971182    27.94058   ]]

Without rotation, this is what I get:

[[ 0.          0.00822778  0.00959557]
 [ 0.04637501 -0.01431042 -0.02822099]
 [-0.01059805 -0.01377504 -0.03283611]
 [-0.01417696 -0.01534551 -0.00800313]
 [ 0.08252529 -0.05453904 -0.04518817]]

It's been a while since I've looked at this code — not sure what's wrong!