Skipping v1.7 since I never got around to uploading it.
I've dropped the atom trajectory stuff because it's pretty outdated and not that interesting.
I have made some minor changes to how the code determines when it needs to calculate coefficients for a volume element or not; in some cases they may have been calculated more than once, wasting resources. There is also a new "allCoeffs" method to calculate the entire coefficients matrix, which may be useful for cases where the interpolant field doesn't change and we will re-use it (this is not a good idea for a use case where you are frequently updating the field and only sampling part of it). The next version might include an option to save these coefficients to a file for later use.