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Revision 2020

util.py: list_subset(): Added default param to specify the value to use for invalid indexes (if any)

             list_set(list_, idx, default, default)
             return default
     def list_subset(list_, idxs):
         '''@param idxs list|None If None, returns entire list'''
     subset_skip = object() # tells list_subset() to leave out invalid indexes
     def list_subset(list_, idxs, default=subset_skip):
         '''
         @param idxs list|None If None, returns entire list
         @param default The value to use for invalid indexes, or subset_skip to leave
             them out of the returned list
         '''
         if idxs == None: return list_
         subset = []
         for idx in idxs:
             try: subset.append(list_[idx])
             except IndexError: pass
             value = list_get(list_, idx, default)
             if value != subset_skip: subset.append(value)
         return subset
     def list_eq_is(list0, list1):

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