MNT: configparser use strict as False.

when read .cfg file, sometimes it shows DuplicateSectionError.

Author: dragonyanglong

src/diffpy/pdfgui/gui/mainframe.py

@@ -298,7 +298,8 @@ def __customProperties(self):
         self.runningDict = {}
 
         # The configuration parser for getting configuration data.
-        self.cP = QuotedConfigParser()
+        # self.cP = QuotedConfigParser()
+        self.cP = QuotedConfigParser(strict=False) #Long try this to avoid DuplicateSectionError
 
         # Set the program mode
         self.mode = "fitting"