Merge branch 'feature/kostyantyn/test-output' into 'master'

testrun.sh improvements

A number of improvements to `testrun.sh` script aiming to improve output of non-regression tests during test failures. The improved script reports the details of the following:

- instrumentation and compile-time failures.
- output of failing programs (i.e., programs existing with a non-zero status).
- difference in the outputs of executables generated from instrumented and original sources 

See merge request !37