GET /<calculation_id>/results/types/<head|drawdown>/layers/<layer_idx>/idx/<total_time_idx>
returns json with all results for given calculation_id, head or drawdown, layer_idx and total_time_idx
GET /<calculation_id>/results/types/<head|drawdown>/layers/<layer_idx>/idx/<total_time_idx>?output=image
returns image for given calculation_id, head or drawdown, layer_idx and total_time_idx
GET /<calculation_id>/results/types/<head|drawdown>/idx/<total_time_idx>?output=colorscale