Remove dict_ prefix for dictionnary.

See commit on shared-pointer.

example/ex-dict04.c

@@ -5,12 +5,12 @@
 /* program that reads text from standard-input, 
    and prints the total number of distinct words found in the text. 
 */
-DICT_SET_DEF2(str, string_t, STRING_OPLIST)
+DICT_SET_DEF2(dict_str, string_t, STRING_OPLIST)
 
 int main(void)
 {
   M_LET(word, STRING_OPLIST)
-    M_LET(wordcount, DICT_SET_OPLIST(str, STRING_OPLIST)) {
+    M_LET(wordcount, DICT_SET_OPLIST(dict_str, STRING_OPLIST)) {
     while (string_fget_word(word, " \t\n,.!;:?", stdin))
       dict_str_set_at(wordcount, word);
     printf ("Words: %lu\n", dict_str_size(wordcount));