* Reset Pilatus.Interface.__acquisition_start_flag on acqStop so
  getStatus returns to AcqReady
* Reduced Pilatus.BufferCtrlObj._ImageReader poll time from 0.5 to 0.1 s
* Added Pilatus.BufferCtrlObj.setTmpfsSize to control MaxNbBuffers
* Fixed Core.Exception(s) typo
* Added CtSaving::getSaveCounters, providing information of frames
  in the saving queue (already compressed)
* Removed CtSaving limitation forcing to activate Nexus if using CBF.
* Implemented CtControl::abortAcq to call stopAcq through a different
  thread if decide to abort from a callback
* Properly abort acq. from CtControl::_checkOverrun, determining if
  the saving is slow because of the filesystem or the compression
* Acknowledge global (external) LDFLAGS in Processlib build Makefile