Add triangular mesh support and octree acceleration #1057
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Add a new geometry to model triangle meshes, e.g. from .stl files.
This will be extended in future commits to a full octree.
Add octree acceleration of howfar, iswhere and hownear. Several previously unnoticed bugs have been fixed: 1) Envelope bug fix improved by adding a small boundary tolerance around dist=0. 2) Corrected bug where not all triangles would be added to any suboctant. This is a problem since they must be contained in at least one suboctant if they are contained in the octant.
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Adds support for STL triangular meshes, thanks to @mxxo. Also adds octree acceleration to the implementation, similar to egs_mesh, thanks to @a-l-demelo.