stop hiding exceptions

excepthook was used before 2b09109
that claims segfaults being cause by it.

Could not reproduce segfaults - and rather have an error message popping
up.
Otherwise in case of exception somewhere along the chain, ilastik looks
like it's doing nothing and one wouldn't know.

volumina/pixelpipeline/datasources/lazyflowsource.py

@@ -46,7 +46,7 @@ def wrapper(*args, **kwargs):
             return func(*args, **kwargs)
         except Slot.SlotNotReadyError as ex:
             # Translate lazyflow not-ready errors into the volumina equivalent.
-            raise_with_traceback(IndeterminateRequestError(ex)).with_traceback(sys.exc_info()[2])
+            raise IndeterminateRequestError() from ex
 
     wrapper.__wrapped__ = func  # Emulate python 3 behavior of @functools.wraps
     return wrapper
@@ -105,11 +105,10 @@ def __init__(self, outslot, priority=0):
 
         # Attach an OpReorderAxes to ensure the data will display correctly
         # (We include the graph parameter, too, since tests sometimes provide an operator with no parent.)
-        self._op5 = opReorderAxes.OpReorderAxes(
-            parent=outslot.operator.parent, graph=outslot.operator.graph
-        )
+        self._op5 = opReorderAxes.OpReorderAxes(parent=outslot.operator.parent, graph=outslot.operator.graph)
         self._op5.Input.connect(outslot)
         self._op5.AxisOrder.setValue("txyzc")
+        self._op5.name = "reorder_lazyflow_source_to_volumina"
 
         self._priority = priority
         self._dirtyCallback = partial(weakref_setDirtyLF, weakref.ref(self))

volumina/tiling/__init__.py

@@ -553,7 +553,7 @@ def _fetch_layer_tile(self, timestamp, ims, transform, tile_nr, stack_id, ims_re
                 if stack_id == self._current_stack_id and cache is self._cache:
                     self.sceneRectChanged.emit(tile_rect)
         except BaseException:
-            logger.debug("Failed to fetch layer tile", exc_info=True)
+            raise
 
     def _onLayerDirty(self, dirtyImgSrc, dataRect):
         """