Added DAQ preview class

tomcat_bec/devices/gigafrost/gfutils.py

@@ -129,6 +129,8 @@ def max_framerate_hz(exposure_ms=_min_exposure_ms, roix=_max_roix, roiy=_max_roi
      Gerd
 
     """
+    # pylint: disable=invalid-name
+    # pylint: disable=too-many-locals
     if exposure_ms < 0.002 or exposure_ms > 40:
         raise ValueError("exposure_ms not in interval [0.002, 40.]")