Orientational order parameter

[p-j-smith]

Is your feature request related to a problem? Please describe.
Currently lipyphilic has a tool to calculate the coarse grained orientational order parameter over individual lipids (rather than along a tail). However, a tool to calculate the orientaitonal order parameter in all-atom systems (as a function of carbon position along a tail) would be very useful.

Describe the solution you'd like
A new analysis class to calculate the orientational order parameter along an acyl tail.

Describe alternatives you've considered

Additional context
See Piggot et al. for a discussion on the correct way to calculate the orientational order parameter, including for unsaturated acyl tails.