Interface CrystFEL with Karabo and allow automatic parameter tunning with rcrystfel

• Added CrystFELRunner to serve as an interface between Karabo and CrystFEL, and allow for automatic parameter optimization using rcrystfel.
• Added PickyBoi, which selects a set of trains to be sent forth for further processing.
• Added PpuKernel
• CrystFELRunner receives all command line options in a single vector of strings (crystfelArgs.misc).
• CrystFELRunner cleanly frees all resources after stopping CrystFEL.
• If an end-of-stream message is sent (ie: by PickyBoi), CrystFEL is automatically stopped.
• CrystFELRunner collects results of CrystFEL and shows them as properties (more may be added later).
• CrystFELRunner generates temporary geometry files based on its contents if the slot buildGeometry is called with a list of strings.
• PickyBoi now has a property breakStreamAfterEnd, which sends an end-of-stream message to all clients, alerting CrystFELRunners to stop CrystFEL automatically.

Other (by @hammerd, and about which I have no clue) -- this should be checked by @hammerd to avoid disaster:

• BaseArbiterKernel, ShmemTrainMatcher, DetectorAssembler and FrameSelectionArbiter have also been changed, relative to master.
• Many changes in the correction classes.