IUNIT ARREY ELEMENTS MODFLOW UPDATE

* feat(ModflowFlwob): Add method to load package from file. * feat(ModflowFlwob): Add various flow-obs types to model.mfnam_packages dictionary. * Add load function to ModflowFlwob ( #598) * Fix(mbase.py): laytyp property method call to 'UPW' package. * Required changes to so that the Polygon.pyshp_prts handled holes correctly for multiple shapefile versions * feat(export_contourf): export filled contours to shapefile ( #599) * fix(mfuzf): enforce boolean values for several uzf option arguments ( #597)

IUNIT ARREY ELEMENTS MODFLOW UPDATE

* refactor(t041_test): Update test041 to specify irefsp, layer, row, and column as zero-based indices. * refactor(codacy): Refactor docstrings to break up long lines.

Updated write_file method and docstring accordingly. * refactor(ModflowFlowb): Treat variables irefsp, layer, row, and column as zero-based integers to align behavior with ModflowHob. Minor formatting changes->uniform capitalization and alignment with parallel variables in the ModflowFlwob docstring. * docs(ModflowHob): Explicitly state that variables irefsp, layer, row, and column are zero-based integers. * Zero-based integers for select ModflowFlwob variables ( #596) * fix creep of btn obs loactions when reading and writing ( #592) * suppressing error when proj4_str is None * suppressing error when proj4_str is None ( #590) * Updated drop axis routine to squeeze axis 1 for vertex grids * update to ansform() to set x and y dtypes to float (found during fix #588) * updates to UnstructuredPlotUtilities, added irregular_shape_patch() as patch for cross section drawing of vertex and unstructured modelgrids that include multiple geometries (found during fix #588)

* updates to ntour_array() and plot_array() to drop extra dimension from head array with using vertex model grid #588 * added test_tricountour_NaN() to t007_test.py * updates to ntour_array() and _ntour_array() to allow nan to be passed in the array * Fix(plotting): Bug fixes for issues #587 and #588 * Fix(plotting): Bug fixes for issues #587 and #588 ( #589)

Iunit arrey elements modflow