* src/LR0.c, src/derives.c, src/gram.c, src/gram.h, src/lalr.c,

* src/LR0.c, src/derives.c, src/gram.c, src/gram.h, src/lalr.c,
* src/nullable.c, src/output.c, src/print.c, src/print_graph.c,
* src/reader.c, src/reduce.c, src/state.h, src/symtab.h
(token_number_t, item_number_as_token_number)
(token_number_as_item_number, muscle_insert_token_number_table):
Rename as...
(symbol_number_t, item_number_as_symbol_number)
(symbol_number_as_item_number, muscle_insert_symbol_number_table):
these, since it is more appropriate.