- Add acc_dead_time and acc_live_time attribute

- add extra test into CtControl::ReadImageBase

	set lat_time to min_lat_time if lat_time < min_lat_time
- remove spec specific behaviour for setAcqExpoTime methode

HwSyncCtrlObj: set as public the validRangesChanged() method for callback

ie: min_expo_time,min_latency_time....

- add wrapping for methode getAcqMode and setAcqMode in HwSyncCtrlObj.sip

* PriamSerial.h/.cpp, set the low level thread-safe with a mutex, fix the pb
  timeout on espia_serial when 2 threads try to acess priamAcq for writing.
* PriamAcq.cpp, fix bug with wrong MCR2 bit access to reset the FIFO, invert
  with bits for reseting the chip.

  timeout on espia_serial when 2 threads try to acess priamAcq for writing.
* PriamAcq.cpp, fix bug with wrong MCR2 bit access to reset the FIFO, invertion
  with bits for reseting the chip.

 -> add a mode for accumulation (AccTimeMode : Live or Real)
 -> In Accumulation add two methode for live and deadtime
	- getAccLiveTime
	- getAccDeadTime

attributes

	Still calculate m_acc_nframes even if acqMode != Accumulation

- add new mode into DevCcdSetMode (AutoHeader on bit 16)
- change the behaviour of DevCcdHeader:
  if mode == AutoHeader: update the next frame header instead of the common header