Add arxiv link for the porous anisotropy paper.
Simplify the 3D lid-driven cavity example.
Simplify the 2D lid-driven cavity example.
Add comments in the Kida vortex flow example.
Update the channel flow example with the latest code.
Create a turbulence directory in examples/
Add the stats module mixing to the Kida example.
Add cylinder geometry.
Change definition of an unused node to be a node that is not connected
to any _fluid_ nodes.
Change geo_encoder to use node tagging.
Make it easy to switch boundary conditions in the cylinder example.
Add support for arbitrary wall alignment to halfway bounceback.
Cleanups.
Controller formatting + unused code cleanup.
Declare unused_tag_bits in the constructor.
Move stat kernels from channel_flow to the MixIn class.
Fix boundary marking.
Add error message for GeometryError.
Use convolution in 2D as well.
Add support for propagation-only nodes.