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code clean move Item_func_additive_op to functions directory

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drizzled/item_func.cc
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}
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/**
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  Set precision of results for additive operations (+ and -)
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*/
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void Item_func_additive_op::result_precision()
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{
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  decimals= cmax(args[0]->decimals, args[1]->decimals);
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  int max_int_part= cmax(args[0]->decimal_precision() - args[0]->decimals,
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                        args[1]->decimal_precision() - args[1]->decimals);
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  int precision= cmin(max_int_part + 1 + decimals, DECIMAL_MAX_PRECISION);
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  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
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  if (result_type() == INT_RESULT)
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    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
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  else
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    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
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  max_length= my_decimal_precision_to_length(precision, decimals,
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                                             unsigned_flag);
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}
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/**
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  The following function is here to allow the user to force
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  subtraction of UNSIGNED BIGINT to return negative values.
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*/