Add plucking rod experiment plots

In these plots we can see the underdamped response of the rod
vibrating in elevation, and in azimuth, with the ball fixed.

The frequencies are slightly lower than the artifact we were
seeing while flying.  We think this is caused by the extra ball
adding tension to the rod.

This phenomenon is minor in amplitude, but may need to be filtered
out in control experiments if they are sensitive to derivatives.
First Lisa data recording

rotated the carousel by hand to get some data to compaire to the other sensors
Manually rotate the carousel in two directions

This was just a sanity check of the gyro measurements.

Gyro data seems to have an offset of + 0.0202 rad/s
More sanity checking of gyro

Where the steep ramp transitions to the shallow ramp,
you can see a step response lasting several seconds.

In the next experiment we will record actual step responses
around the reference.
Offset sin experiment 0.3 Hz

Ball was strapped down, so this is mainly for testing the arm.

ran run_offset_sin_experiment()