Execution of test cases for validating patches

[martinezmatias]

Just one idea for improvement:
To delegate the validation of candidate patches to Test-Runner (probably passing via the Flacoco's API).
This solution would have different advantage:

• To delegate all test execution to one component (i.e., Flacoco/Test runner)
• To be able to run test cases for a test framework that we also support in the FL stage.