- update RTD workflow
- update CI workflow
- remove setup.py
- move shape data

- get_structured_grid_ds: create a structured grid DataSet
- get_vertex_grid_ds: create a vertex grid Dataset

- allow creation of datasets based on flopy modelgrid objects
- supports both vertex and structured grid

- add gridtype attr
- improve reading grids at real-world coords
- set delr/delc for structured grids

add correct x,y-offsets

fix #171
header reading is now fine if not all ascii keys:
        "ncols",
        "nrows",
        "nodata_value",
        "xllcorner",
        "yllcorner",
        "cellsize",
        "xllcenter",
        "yllcenter",
    are in the header

* Add option to only use most common station

Slow determination of stations (locations.geo.get_nearest_point) is removed

* solve minor bug and add test for most_common_station=True

* Set gridgen files in a separate directory. Solves issue #158

* minor changes

* Make most_common_station work with structured grids as well

* Create gridgen directory when it does not exist

* Solve fiona.errors.DriverError:  not recognized as a supported file format.

* Remove rasterstats as a dependency for tests and docs

* Codacy stuff

* Add option to only use most common station

Slow determination of stations (locations.geo.get_nearest_point) is removed

* solve minor bug and add test for most_common_station=True

* Set gridgen files in a separate directory. Solves issue #158

* minor changes

* Make most_common_station work with structured grids as well

* Create gridgen directory when it does not exist

* Solve fiona.errors.DriverError:  not recognized as a supported file format.

* Remove rasterstats as a dependency for tests and docs

* Codacy stuff

isort+blac