JannePeltonen

v12 - fixed casting warnings on 32-bit systems - added commits that revamp validation test code a bit and add tests for the new operation types

v13: Fixed clang warning about possibly uninitialized variable

v14: rebased to get rid of the prerequisite commits that are now in master

v15: rebased, added review-tags in the API commits, made the grammar improvement in the API sentence, changed the type of the variable to signed (does not change the outcome).

v16: updated review-tags