* New features:
* A Grid() instance can now be "numpified" so that pickling can be done, method `numpify_carrays()`
* An existing GridProperty() instance should now accept scalar input which will be broadcasted to
the full array
* Added a method so one can create a GridProperty instance directly for a Grid() instance 291
* Added several alternatives to instantate Points(), e.g. from a list of tuples
* A general method that finds the IJK indices in a 3D grid from from Points() is made `get_ijk_from_points` 287
* For RegularSurface(), the `fill()` methid will now accept an optional fill_value (constant) 294
* Bug fixes:
* Making surface write to BytesIO stream threading safe (Irap binary format)
* Assigning a GridProperty() inside/outside a polygon is now more robust.
* Many internal build fixes and improves, including requirements.txt
* For surfaces, some operator overload function changed unintentionally the `other` instance 295
* For surfaces, operator overload on instances with same topology will not unintentionally trigger resampling