Testsuite code should remove output directories before tests

[Roland Haas]

The current testsuite driver code does not remove output directories ins TEST/sim/THORN which can hide issues if a new revision of the code simply no longer produces an output file if an older test is still present.

There is also one test (Hydro_RNSID/rnsA2.par) that internally writes and reads data to a file while it runs. If the file is already present, then not all code is tested.

To test this, place a new file into an output directory, run the tests and the file will still be present.

Keyword: None

[Roland Haas]

The testsuite system does in fact clear the output directory (or at least all files of the form .). The code at fault is Hydro_RNSID's test which writes to he current directory rather than $parfile.