Known Issues with 1.2.40

The terrain rendering feature in aven is still somewhat experimental, and has a few known limitations:

• #56 The altitude of the terrain and altitudes from GPS fixes don't match (typically off by a few 10s of metres)
• aven in the Microsoft Windows build gives an error on start-up - this should be fixed in 1.2.41.
• aven on macOS 10.14 crashes trying to draw the cave (#101) - this is hopefully also fixed in 1.2.41.