Cluster reading, expression templates (#99)

Co-authored-by: froejdh_e <erik.frojdh@psi.ch>

python/aare/__init__.py

@@ -5,6 +5,7 @@ from . import _aare
 from ._aare import File, RawFile, RawMasterFile, RawSubFile
 from ._aare import Pedestal, ClusterFinder, VarClusterFinder
 from ._aare import DetectorType
+from ._aare import ClusterFile
 
 from .CtbRawFile import CtbRawFile
 from .ScanParameters import ScanParameters