Charts - render the Sun and Moon more realistically

[johanley]

Show the apparent size of the Sun.

Show the apparent size and phase of the Moon. Show the polar angle of the crescent's axis.

At the moment, the Moon is shown as a simple small dot. At times of occultations, the star being occulted is being shown a small distance away from this dot.

[johanley]

Checked in a partial fix. The rendering of the Sun-Moon-planet is now sensitive to the object's apparent size, in relation to the size of the chart.