Provide more information on solar angles in remote sensing view

[Joern Ungermann]

The current solar angle view should document its colorbar and provide further options to visualise solar angles with respect to azimuth and elevation.

[Reimar Bauer]

Update of solar angle remote sensing tool

Provide textual description of color bar. Provide selection of different measures of solar angle (total, including sunset, azimuth only, elevation only).

Fix issue #311

→ <<cset 3f6da1f6fb02>>