Add *.vts into .gitignore
Add legacy paraview scripts for batch vizualization of panel strikes
Patch bomb:
- all internal APIs work now with 9-nodes vector instead of 5-nodes array and 9-ints mapping
- prepare_node and find_nodes_on_previous_time_layer moved back into method
- new mandatory API call interpolateNode added into all mesh impls
Update basic P-wave tests for both tetr and cubic meshes
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/libgcm/calc/volume/SimpleVolumeCalculator.cpp
	src/libgcm/calc/volume/SimpleVolumeCalculator.h