Show backtraces in interface checks

[goerz]

Any exceptions occurring in the check_* routines that test the various interfaces now show a truncated backtrace. This should make it much easier to pinpoint problems.

[codecov[bot]]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (68671fb) 88.7% compared to head (82e9350) 88.6%.

Files	Patch %	Lines
src/interfaces/propagator.jl	57.9%	8 Missing :warning:
src/interfaces/generator.jl	50.0%	3 Missing :warning:
src/interfaces/amplitude.jl	80.0%	1 Missing :warning:
src/interfaces/operator.jl	83.4%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #57 +/- ## ======================================== - Coverage 88.7% 88.6% -0.0% ======================================== Files 24 25 +1 Lines 1767 1788 +21 ======================================== + Hits 1567 1584 +17 - Misses 200 204 +4 ```

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