Prototype support clone cells in computational grid generation

[leendertvanwolfswinkel]

For the prototype / dev version, we treat all obstacles as cutlines. In a later stage, we may either introduce a new layer in the schematisation (clone_cell_cutline) or add a boolean attribute to the obstacle layer (is_clone_cell_cutline).

Implement the following in threedigrid-builder:

• cut the cells into clone cells w/ the cutlines and rasterize the cell ids

  • "snap to pixel grid" the cutlines

• rework the cells and lines make the flowlines (fortran) based on the area mask

  • every clone cell domain needs to contain at least 1 data pixel
  • reorder the 2D nodes and lines
  • create flowline (type) between cloned cells (needed info: exchange level, cutline length). the kcu type of this flowline will be a new kcu type.

• Write clone cell/flowline information to gridadmin #397

• rasterize the node id's and write this as a separate "node id mask" GeoTIFF (to be used in threedi-tables later)

[leendertvanwolfswinkel]

@GolnesaK will also be working on this, i.e. the FORTRAN parts of gridbuilder that are involved