Tests for BayesInf and general cleanup

Some simple fixes for various test, start on testing Discrepancy, MCMC, BayesInf, BMC, output directory as changeable parameter in BayesInf, general cleanup

assigned to @RKohlhaas

added 3 commits

• cd0e1ebb...3a112da3 - 2 commits from branch develop
• 0aef32a3 - Merge branch 'develop' into 'fix/BMC'

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