after a Stop command is sent, using getMaxIdleWaitTime,
  which includes in the internal exposure time if 2.x <= FW < 3.0
* Added Frelon::Camera::syncRegsBadHTD to improve
  initialisation sequence if 2.x <= FW < 3.0:
  + If camera is not idle and not in ExtGate, send a Stop command
  + Always attempt to wait for idle status
  + Force an Aurora link reset on startup to trigger
    FPGA reconfiguration, solving blocking problems
  + Added Frelon::Model::hasHTDCmd (from v2.0c on), used to force
    hardware trigger enabled
* Improved Frelon::Camera::setExpTime:
  + Better error detection and simpler sequence
  + Round to MinExp (1 us) if positive but less than that
  + Only use Microseconds TimeUnit if Milliseconds is not precise enough
* Do not start Frelon::Camera if already started
* Better debug around waitIdleStatus in Frelon::Camera::stop,
  printing real time spent waiting
* Activate Espia SG Roi in Frelon::RoiCtrlObj::checkEspiaRoi only
  if Camera Roi is different than requested one
* Export CtSaving feature allowing to manually save multiple
  concatenated frames (stripes) as a single image