diet client: use boost::format
JsonObject: warns about getArrayProperty, only works with array of strings
json serialization: add unit test suite
json serialization: add unit tests for diet_profile_t (de)serialization
utils: user id was not serialized in JSON for TMS_Data::Job

add corresponding unit tests
utils: add failing test for serialization of TMS_Data::SubmitOptions
diet client: simplify getTimeout
tests: rename utilsTests suite into utilsUnitTests