Pygeogrids

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- Refracture package to pyscaffold 3 standard

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- Allow subsetting from non-binary masks
- Fix ParallelArcDist function (two calls of deg2rad(lat))
- Update readme
- Update to PyScaffold 2.5.9

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- Fix speed bug of gpi2cell
- Update copyright header

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- Add option to subset a grid with a shape file (OGRGeometry) in
get_shp_grid_points.
- Add shapefile module for reading shapefiles from
http://biogeo.ucdavis.edu/data/gadm2.8/gadm28_levels.shp.zip by Global
Administrative Level
- Ensure that `get_bbox_grid_points` returns points while taking cell order into
account.

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- Fix bug in calc_lut in case of differently ordered subset of a grid.
- Add function to reorder grid based on different cell size. (See grids.reorder_to_cellsize)

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- Add option to load grids with non standard variable name for gpis.