[test] Implement outflow BC for 1p tracer test
Feature request Implement an outflow BC for the 1p tracer model to provide a better example for users. What does this feature / why does DuMux need it: Came up when fixing #782 (closed)
Feature request Implement an outflow BC for the 1p tracer model to provide a better example for users. What does this feature / why does DuMux need it: Came up when fixing #782 (closed)