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A few updates
allow custom grid to be distorted, so you can feed in data from a simulation or observation and overlay the LIC distortion on top (as is used for polarisation plots in astrophysics observations, and for velocity fields in astrophysics simulations)
modifying imports for consistency
modified import for tensorflow to support older logic used in code
allow earlier versions of CMake (version 4 previously required is not in standard apt-get management for some older versions of Ubuntu, but it compiles fine with 3.5)
(Note: this is my first pull request, hopefully I'm doing this right!)