Arlie Capps

Add example of enhanced and reduced connectivity

5

Add an example of 2D and 3D multiblock grids with enhanced and reduced connectivity. Example renderings by VisIt:  

If ascent_actions.yaml exists, it overrides what the user passes to Ascent::execute()

2

`Ascent::execute()` lets the user pass in a Node with actions: https://github.com/Alpine-DAV/ascent/blob/develop/src/libs/ascent/ascent.cpp#L371 But then, if `CheckForSettingsFile()` finds a file named ascent_actions.yaml, that file replaces whatever the user passed to `execute()`: https://github.com/Alpine-DAV/ascent/blob/develop/src/libs/ascent/ascent.cpp#L135...

https://github.com/Alpine-DAV/ascent/blob/e504a28c7a1a6d89b40fa9db17a19fc21d1e7b35/src/libs/dray/rendering/renderer.cpp#L353 Here, my compiler errors out because e.g. `0.1 * 2.0 - 1.0` is a double literal getting stored as a float32. The compiler suggests using `static_cast( )`. Grumpy, because...