testsuite: use --quiet and test output of stdio commands more thoroughly

* All test suite commands are now invoked with --quiet.
  When having to check the stdout of the test runs, you now longer have to filter
  "Info:" lines out or include them in the expout.
* Use expout to compare the outputs of the stdio commands instead of just
  counting the number of output lines.
* The <EO> command check is simplified by doing the arithmetics in SciTECO.
* test the --stdin and --stdout options as well

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