get_by_month_array
Description:
Gets the by_month array from Recurrence.
The array size is I_CAL_BY_MONTH_SIZE.
Parameters:
| this | The Recurrence | 
Returns:
| The by_month of Recurrence. | 
Gets the by_month array from Recurrence.
The array size is I_CAL_BY_MONTH_SIZE.
| this | The Recurrence | 
| The by_month of Recurrence. |