Housekeeping Tests

[henrij22]

• Check tolerances in testsuite (The used tolerance throughout the test suite should be the same)
• checkFEByAutoDiff is duplicated in testcommon.hh and checkfebyautodiff.hh. This has to be sychronized
• Replace all try and catch statements in tests with checkThrow. See testadaptivestepsizing for example
• Add a check in the function resetNonLinearOperatorParametersToZero(), which checks if the number of parameters in the nonlinear operator is 2.
• use testing framework for python Homogenize Python Bindings for DirichletValues + Support for fixing Subspace Basis #305 (comment)