- small clarification in message on top namespace import

Some users were confused by "error" message when importing Calculator like `from pysipfenn import Calculator`, as feedback on missing dependencies for model export was showing up (without throwing an error). This commit should make things more clear.

pysipfenn/core/modelExporters.py

@@ -9,10 +9,9 @@
     from onnxconverter_common import float16
     from onnxsim import simplify
 except ModuleNotFoundError as e:
-    print(f'Could not import {e.name}.\n')
-    print('Dependencies for exporting to CoreML, Torch, and ONNX are not installed by default with pySIPFENN. You need '
-          'to install pySIPFENN in "dev" mode like: pip install -e "pysipfenn[dev]", or like pip install -e ".[dev]" if'
-          'you are cloned it. See pysipfenn.org for more details.')
+    print('Note: Dependencies for exporting to CoreML, Torch, and ONNX are not installed by default with pySIPFENN. You'
+          ' need to install pySIPFENN in "dev" mode like: pip install -e "pysipfenn[dev]", or like pip install -e '
+          '".[dev]" if you are cloned it. See pysipfenn.org for more details.')
 
 
 class ONNXExporter:
@@ -280,4 +279,4 @@ def exportAll(self):
         """Export all loaded models to CoreML format with the export function."""
         for model in tqdm(self.calculator.loadedModels):
             self.export(model)
-        print('*****  Done exporting all models!  *****')
+        print('*****  Done exporting all models!  *****')