Consistency in axis specification

[jkosciessa]

Some of the axes may lack proper labels with respect to the original reference point.

• The real profile is estimated from the exit plane of the transducer, but the simulation results usually include a large part of the transducer (confusingly, they do not start at the bottom of the transducer).
• The OG calibration added the distance between [the bottom of the transducer bowl and the exit plane] to the real profile. In other words, what we used to plot on the x-axis wasn't the axial position from the exit plane, but from the bottom of the bowl.

[jkosciessa]

I am currently revising plot_isppa_over_image to add info on multiple axis points of the simulation, such that the expected output can be validated.

[jkosciessa]

Added those updates along with a transducer_calibration function to a new branch reporting.

[jkosciessa]

Merged into development.