Locale support for STXNG has been broken. Resetting the locale

settings is not a good idea. string.letters delivers also locale
base characters when the locale module is not included.

lib/python/StructuredText/STletters.py

 import string
-try:
-    del string
-    import locale
-    locale.setlocale(locale.LC_ALL,"")
-except:
-    pass    
-
-import string
 
 def punc_func(exclude):
     punc = r''