fix to exceptHook - add a bit of instruction

Author: vondreele

GSASII/GSASIIctrlGUI.py

@@ -572,7 +572,7 @@ def _TestValidity(self):
             if self.Validator:
                 self.Validator.TestValid(self)
                 self._IndicateValidity()
-        except RuntimeError:
+        except RuntimeError:    #bandaid to avoid C++ error; deleted self.Validator?
             pass
 
     def _IndicateValidity(self):

GSASII/GSASIIpath.py

@@ -1158,7 +1158,7 @@ def bwTB(): print(IPython.core.ultratb.ListTB().text(*args)) # uncolored
         locals['vTB'] = vTB
         locals['bwTB'] = bwTB
         msg = f'IPython console: {frame.f_code.co_filename}, line {frame.f_lineno}'
-        msg += '\n[TB(), vTB()/vTB(0) & bwTB() for tracebacks]'
+        msg += '\n[TB(), vTB(-n)/vTB(0) & bwTB() for tracebacks to n levels back]'
         ipshell(msg,local_ns=locals,global_ns=frame.f_globals)
     except:
         msg = 'Entering IPython console (not in error contex)'