Elevation colour bands in Aven

[Erin Lynch]

> One thing that is a problem with this is that
elevation detail 
> is difficult to determine by colour due to the wide elevation

> range of the caves (615m to 40m). 

We have the same problem with our data from Houping and Tianxing.
User-defined ranges for the colours would be useful.  Ideally, I'd like to
have the option to split the colour bar into a variable (user-determined) 
number of sections and set the end values of each section. This would be 
a real aid for visualizing caves which have distinct levels of horizontal 
development.

Cheers,
Erin



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