- Add multipart support to the interface and enable its use out of tasks.

  Examples on the use out of tasks are provided in:
  `example/Tutorial3/digitization/TestDetectorDigiLoader.tpl:76-85`: sending a part.
  `example/Tutorial3/reconstruction/FairTestDetectorMQRecoTask.tpl:177-182`: receiving a part.

- This commit also makes structure within processorTask more consistent with samplerTask.

- add macro MQLOG to FairMQLogger.
New Tutorial6  added : initialisation with MQ Applications. Added new CMake Module for SQL DBs drivers
solve conflict with dev and make condiconal build of tutorial 6