automated tests against memory leaks

[kglowacki]

this is a bit tricky to do, but possible with a separated nightly job running on jenkins. in that case we'd have a separate 'test component' that would be the only one used to build unit-test-app. such component would implement several actions running in a long-lasting loop (maybe even emulate our main loop), and report average heap consumption. After X iterations we expect that no more memory is being consumed.