Clearer print statements

[viktor-rick]

Is your feature request related to a problem? Please describe.
A beginner engineer might have too much info on the viktor-cli test result. Ideally we'd clearly show what is going wrong and why.

Describe the solution you'd like
old:

...
Falsifying example: test_view_handles_input_gracefully(
    self=<test_views.TestViewBehavior testMethod=test_view_handles_input_gracefully>,
    params=Munch({'input': Munch({'nodes': [], 'supports': [], 'point_loads': [], 'distributed_loads': [], 'profile_type': 'IPE', 'steel_class': 'S235', 'include_weight': False})}),  # or any other generated value

...
We've found a configuration that will show an error for your end-users:
    method="generate_calculation",
    params={
          'input': {
                 'nodes': [],
                 'supports': [],
                 'point_loads': [], 
                 'distributed_loads': [], 
                 'profile_type': 'IPE', 
                 'steel_class': 'S235',
                 'include_weight': False
                }
           )}

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.