Add method to segmented mirror to display segment numbers

[ivalaginja]

It might be useful to write a little method for the SM class that allows to display the segment numbering. Not super high priority I'd say.

[ehpor]

I added a function to do this in b02a394, but generalized to any actuator basis so that it also works on non-segmented DMs. Example usage code below.

from hcipy import *
import matplotlib.pyplot as plt
import numpy as np

pupil_grid = make_pupil_grid(512)
num_rings = 5

segment_positions = make_hexagonal_grid(0.5 / num_rings * np.sqrt(3) / 2, num_rings)
aperture, segments = make_segmented_aperture(hexagonal_aperture(0.5 / num_rings - 0.003, np.pi / 2), segment_positions, return_segments=True)

aperture = evaluate_supersampled(aperture, pupil_grid, 2)
segments = evaluate_supersampled(segments, pupil_grid, 2)

imshow_field(aperture, cmap='gray')
label_actuator_centroid_positions(segments)
plt.show()

[ehpor]

Another general example for a tilted DM:

from hcipy import *
import matplotlib.pyplot as plt
import numpy as np

pupil_grid = make_pupil_grid(512)

inf = make_gaussian_influence_functions(pupil_grid, 11, 0.8 / 11, y_tilt=np.radians(25), z_tilt=np.radians(10))

# Display waffle pattern on DM
imshow_field(inf.linear_combination((-1)**(np.arange(len(inf)))), cmap='RdBu')
label_actuator_centroid_positions(inf)
plt.show()