Update setup.py
Add basin fill iconset
Retrieve and store basin coordinates from fews by location id, if they are not set yet
Add docstring to get_coordinates method
Regularly update current fill basin field
Fix a basin.current_fill update bug; updated always due to decimal to float comparison
Add management command for updating basin fill values
Fix django rest framework import
Add on_main_map field to Basin model
Resolve merge conflict
Update CHANGES.rst