Option to Flip projection left to right

[linuxkidd]

• While lying on the ground with your head toward North and feet toward South, East is to your left, and West is to your right.
• This is commonly the orientation of AllSky cameras as well.
• Request making an option to Flip the projection to match this view.
• Turns out, it's super easy to change:

Suggest changing:

ax.set_theta_direction(-1)

to

ax.set_theta_direction(1)

On line 170 in bodies.py