Merge commit 'a7af62e9'

README.md

docs/RELEASE_HISTORY.md

docs/images/301_PowerFields.png

docs/images/302_PolyVectors.png

docs/tutorial.md

include/directional/circumcircle.h

include/directional/complex_eigs.h

include/directional/directional_viewer.h

include/directional/dual_cycles.h

include/directional/glyph_lines_mesh.h

include/directional/polygonal_edge_topology.h

include/directional/polyvector_field.h

include/directional/polyvector_to_raw.h

include/directional/polyvector_to_raw_companion.h

include/directional/power_field.h

tutorial/301_PowerFields/main.cpp

tutorial/302_PolyVectors/main.cpp

tutorial/304_ConjugateFields/main.cpp

tutorial/401_IndexPrescription/main.cpp

tutorial/CMakeLists.txt