* Remove old interpolate angles quick
* Remove old interpolate functions
These are no longer used.
* Add linear interpolate vm function
More clearing functions
* Add physics snapshot struct to silo interpolation
Two of these two functions require an object pointer, so they cannot be in physics_state.cpp
With doxygen documentation
* Try to placate Linux
* Address Feedback
* And update declaration, of course
* Attempt to appease linter
