Code and GUI text cleanup (#926)

* Move int range checkers from options class to common file
* Improve error handling and reporting
* Make some minor improvements to init and test suite
* Fix 'trypewriter' to 'typewriter' typo
* Remove menu path description in dialog help text
* Improve the help text for entries in the Format menu
* Reword a couple of dialog messages

tests/tools.py

@@ -33,14 +33,14 @@ def cmpFiles(fileOne, fileTwo, ignoreLines=None, ignoreStart=None):
 
     try:
         foOne = open(fileOne, mode="r", encoding="utf-8")
-    except Exception as e:
-        print(str(e))
+    except Exception as exc:
+        print(str(exc))
         return False
 
     try:
         foTwo = open(fileTwo, mode="r", encoding="utf-8")
-    except Exception as e:
-        print(str(e))
+    except Exception as exc:
+        print(str(exc))
         return False
 
     txtOne = foOne.readlines()